I'll be flying in on the 'fourth'. [=the fourth day of the month]
He got a base hit in the 'fourth'. [=the fourth inning]
She drank a 'fourth' of the bottle.
(..) Effective immediately, all vessels in the Navy... can no longer be referred to as "she. " We're to call it "it. " - Royce, we need a fourth. - Yes, sir. - You're it. - Thank you, sir. - Hello! - Congratulations on the new job. (..)1997 G.I. Jane