Translation of "Fourth" in Chinese

He's in the fourth year.

他現在四年級。

I come here every Fourth of July.

我每年7月4号都会来这里。

Write your surname on the fourth line.

在第四行写下您的姓。

My apartment is on the fourth floor.

我的公寓在四樓。

My office is on the fourth floor of that gray six-story building.

我的办公室在那幢灰色的六层楼的四楼。