Four Fours/Lemmata/Three Fours/90/Solutions

Puzzle: Three Fours: $90$

Using exactly $3$ instances of the number $4$, the task is to write an expression for $90$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$90 = \dfrac {4!} {.4 \times \sqrt {. \dot 4} }$