Four Fours/54/Solutions

Puzzle: Four Fours: $54$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $54$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$54 = 4! + 4! + 4 + \sqrt 4$

Solution $2$

$54 = \dfrac {4! - 4} {.4} + 4$

Solution $3$

$54 = \dfrac {4!} {. \dot 4} + 4 - 4$