I'm guessing that 1.4 is the (random) number of standard deviations from the mean, so:
(X-500)/50=1.4, X-500=70 and X, the simulated value, =570.
This is based on a standard deviation of 50. The title of the question says SD=40 so:
(X-500)/40=1.4, X-500=56 and X=556.