Calculating distance in miles between point and polygon

Hi. I'm trying to use FME to calculate the distance between a point on the perimeter of a polygon and another point nearby (within 10 miles). I'm using the latitude and longitude coordinate system but I need distances in miles and have not gotten very far on my own. Can anyone point me in the right direction? I'm already using NeighborFinder but can't seem to get the distances right. Thank you.