Question

pronoun agreement?

By the final curtain, ninety percent of the audience had voted with their feet.

Answer 1

It's fine.

Answer 2

http://www.chompchomp.com/terms/collectivenoun.htm

The collective noun is "ninety percent" and the pronoun referring to it is "their."

Do you see why the reference is correct?

Answer 3

yes, thank you

Answer 4

You're very welcome.