I need to know what four times the square root of three hundred eighty four is
Well, sqrt(384)=19.596 X 4=78.384
Which is your answer.
Here's an "exact" answer
4*sqrt(384) = 4*sqrt(2^7 * 3) = 4*sqrt(2^7)*sqrt(3) = 4*2^3sqrt(2)*sqrt(3) = 32*sqrt(6)