and so fourth (forth)

Correct form: "and so forth." Writers often type "and so fourth" because "fourth" is a familiar word, but it's wrong here - the idiom uses "forth" (meaning forward or onward), not the ordinal number "fourth."

Below: a tight explanation, clear usage examples for work, school, and casual writing, ready-to-copy corrections, quick rewrites, memory tricks, and common related errors to watch for.

Quick answer

"And so forth" is correct. "Forth" is an adverb; "fourth" is an ordinal number and does not belong in this expression.

Meaning: "and so forth" = "and other similar things" / "and so on."
Don't write "and so fourth" - it's a typo and has no idiomatic sense here.
Alternatives: "and so on," "etc.," or explicitly list the remaining items when precision matters.

Core explanation

"Forth" appears in several idioms (go forth, bring forth) and means "forward" or "onward." In "and so forth" the phrase signals the continuation of a list or idea. Replacing it with "fourth" confuses meaning with an unrelated ordinal number.

Writers sometimes substitute "fourth" because it sounds similar in speech and is more familiar visually; the correct choice depends on sense, not on sound.

Hyphenation and spacing

No hyphen or special spacing is needed: write three separate words as shown - and so forth. Do not compress into one word, hyphenate, or insert a numeral.

Correct: and so forth
Incorrect: and so-fourth, and-so-forth, andsoforth

Why writers make this mistake

Common causes:

Sound-based guessing: spoken forms hide the difference between "forth" and "fourth."
Typing fast or autocorrect replacing unfamiliar strings.
Low attention during quick drafts or nonnative-speaker interference.

Real usage: work, school, and casual examples

Work - Wrong: Please prepare the report with figures, charts, tables, and so fourth.Work -
Right: Please prepare the report with figures, charts, tables, and so forth.
Work - Wrong: We need to discuss budgets, timelines, resources, and so fourth before sign-off.Work -
Right: We need to discuss budgets, timelines, resources, and so forth before sign-off.
Work - Wrong: Include risks, mitigations, assumptions, and so fourth in the appendix.Work -
Right: Include risks, mitigations, assumptions, and so forth in the appendix.
School - Wrong: The syllabus covers readings, lectures, exams, and so fourth.School -
Right: The syllabus covers readings, lectures, exams, and so forth.
School - Wrong: Study topics include algebra, geometry, trigonometry, and so fourth.School -
Right: Study topics include algebra, geometry, trigonometry, and so forth.
School - Wrong: Bring pencils, calculators, rulers, and so fourth to the test.School -
Right: Bring pencils, calculators, rulers, and so forth to the test.
Casual - Wrong: We'll need burgers, buns, condiments, and so fourth for the barbecue.Casual -
Right: We'll need burgers, buns, condiments, and so forth for the barbecue.
Casual - Wrong: Pack swimsuits, towels, sunscreen, and so fourth.Casual -
Right: Pack swimsuits, towels, sunscreen, and so forth.
Casual - Wrong: I like hiking, biking, kayaking, and so fourth.Casual -
Right: I like hiking, biking, kayaking, and so forth.

Try your own sentence

Paste a sentence into a checker or scan your document for "so fourth" to catch this specific error. Context makes the right choice obvious: if you mean "and others," use "and so forth."

Wrong vs right examples you can copy

Six quick pairs you can paste into drafts and use as replacements.

Wrong: He collects stamps, coins, postcards, and so fourth.
Right: He collects stamps, coins, postcards, and so forth.
Wrong: The box contains screws, nails, washers, and so fourth.
Right: The box contains screws, nails, washers, and so forth.
Wrong: For the party: drinks, snacks, plates, and so fourth.
Right: For the party: drinks, snacks, plates, and so forth.
Wrong: She studies chemistry, biology, physics, and so fourth.
Right: She studies chemistry, biology, physics, and so forth.
Wrong: The toolkit has hammers, wrenches, pliers, and so fourth.
Right: The toolkit has hammers, wrenches, pliers, and so forth.
Wrong: They sell apples, pears, peaches, and so fourth.
Right: They sell apples, pears, peaches, and so forth.

How to fix your own sentence

Don't just replace words mechanically-check tone and clarity after the fix.

Step 1: Identify whether you mean "and other similar things."
Step 2: Replace "and so fourth" with "and so forth" or an alternative like "and so on."
Step 3: Read the full sentence aloud to confirm natural rhythm.

Three rewrite examples that improve flow rather than simply swapping words:

Original: We need plates, cups, napkins, and so fourth.
Rewrite: We need plates, cups, napkins, and other disposable tableware.
Original: The meeting covers schedule, budget, staffing, and so fourth.
Rewrite: The meeting covers schedule, budget, staffing, and related items.
Original: Bring pens, paper, folders, and so fourth.
Rewrite: Bring pens, paper, folders, and anything else you might need.

A simple memory trick

Link the correct form to its meaning rather than to sound. Imagine the list continuing "forward" - that visual ties to "forth."

Think "forth = forward" to remember it signals continuation.
Search your drafts for "so fourth" and replace in bulk.
Add a quick find-and-replace rule: "and so fourth" → "and so forth."

Similar mistakes to watch for

Once one form slips, nearby errors can follow. Scan for these patterns:

Confusing ordinal numbers with adverbs (e.g., "first" vs "forth" mistakes).
Unnecessary hyphenation or improper compounding (e.g., "and-so-forth").
Using "etc." where clarity requires specifics.
Verb-form and word-class mix-ups caused by sound-based writing.

FAQ

Is "and so forth" formal enough for reports?

Yes. It's neutral and acceptable in many reports. In highly technical or legal writing, prefer explicit lists or name the omitted items.

Can I use "and so on" instead?

Yes. "And so on" and "and so forth" are interchangeable; choose whichever fits the sentence rhythm and audience.

Is "and so fourth" ever correct?

No. Using the ordinal "fourth" in this phrase is incorrect; it changes the word class and destroys the idiomatic meaning.

When should I use "etc." instead?

Use "etc." for short, informal lists where the omitted items are obvious. Avoid it in formal writing unless the omitted items are clear to the reader.

What's a fast way to stop making this mistake?

Add a document-wide find-and-replace, read lists aloud during proofreading, or run a quick grammar check that flags idiom errors.

Fix your draft in seconds

Search your document for "so fourth," apply a find-and-replace to "and so forth," and read the sentence aloud to confirm flow. Small habits-search-and-replace plus one read-through-stop this error quickly.