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The manager's reviewed three proposal's.
GRAMMAR RULES / APOSTROPHES
Apostrophes most often mark possession or omitted letters in contractions; they usually do not make ordinary nouns plural.
EXAMPLE
The manager's reviewed three proposal's.
The managers reviewed three proposals.
Neither “managers” nor “proposals” is possessive here. They are ordinary plural nouns, so they do not need apostrophes.
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FAQ
Ordinary plural nouns generally do not use apostrophes.
Singular nouns commonly add apostrophe-s, while plural nouns already ending in s commonly add an apostrophe after the s.
Contractions use apostrophes to mark omitted letters, as in “don't” and “it's.”