Her apartment's on the FOURTH floor,
elevator is broken, you're gonna...
The Big Bang Theory Season 1, Episode 2
...if you would be the FOURTH member
of our "Halo" team.
The Big Bang Theory Season 1, Episode 7
...I finally arrived at the
Fourth Annual Dixie Trek Convention...
The Big Bang Theory Season 3, Episode 5
second, third, FOURTH.
The Big Bang Theory Season 12, Episode 5
I'll be the FOURTH woman ever
to win a Nobel in physics.
The Big Bang Theory Season 12, Episode 19