Rationalize the Denominator $\mathrm { d } = 1.22 \mathrm { x } ^ { 1 / 2 }$

Rationalize the denominator. Assume that all variables represent nonnegative numbers and that the denominator is not
zero.
-A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is $\mathrm { d } = 1.22 \mathrm { x } ^ { 1 / 2 }$ , where x is the altitude of the plane in feet and d is given in miles. How far can one see in a plane flying at 28,000 feet? Round your answer to the nearest tenth mile, if necessary.

A) 204.1 mi
B) 1708 mi
C) 184.8 mi
D) 17,080 mi