1
to consist of;to be made up of;to be composed of
このクラスは３５名の生徒から成り立っている。
This class is made up of thirty-five pupils.
2
to be concluded (e.g. of an agreement);to hold true (e.g. of a theory);to be valid
君の理論は成り立たないと思う。
I think your theory does not hold water.
3
to be viable (of a business, lifestyle, etc.);to carry on;to keep going
そんな場所で本屋をやっても商売が成り立たないだろう。
A bookstore in that location wouldn't make enough money to survive.
Other forms
成立つ 【なりたつ】