Equate This, Part Deux

The Puzzler

RAY: This was from my '4s' series and it was sent in by Elizabeth McCarahan.

Take the number 4 and use it five times to come up with the number 54. You can use any of the math operators you want: addition, subtraction, decimals, fractions, square roots, factorial, any of that stuff. You can't use cube roots because you'd be using the number 3. You can only use the number 4. What's the equation?

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