Four Fours/Lemmata/Three Fours/54

Puzzle

Using exactly $3$ instances of the number $4$, the task is to write an expression for $54$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

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

Also see

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