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.
(..) He waited there three days and three nights till all manner of sea creatures 'came acclimated to his presence. And on the fourth morning, he roped a couple of sea turtles, lashed them together, and made a raft. He roped a couple (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl