Well its close but no Cigar. Mount Davis at 3,213 feet is Pennsylvania highest point. The Arikaree River where it flows from Colorado into Kansas has an elevation of 3,315 feet above sea level....
Construct perpendicular bisectors for 2 of the segments formed from 3 points. Note: this will be the center of the circle that has all three points on it's circumference.
The question is easily answered using the calculator in your computer. But, since you are obviously not capable of doing so, the answer is 0.476 approx.