Play 24

In the game 24, you are given four numbers. Your goal is to make them equal the number 24,
by using all of the numbers given along with the basic operations + - x ÷ and brackets.

Examples
 

1234	1 x 2 x 3 x 4
1346	6 ÷ (1 - 3 ÷ 4)
5878	8 ÷ 5 x (7 + 8)