coordinate system - How would I convert this point to WKID 4326?

This is a point in Brewster, MA, USA. How would it be converted to WKID 4326?

324299.3348436486, 832511.5939650714

Answer

I think you're looking for EPSG:26986. Source: http://www.mass.gov/mgis/dd-over.htm

Projecting your point from 26986 -> 4326 you end up in Brewster, MA: 26986->4326 using spatialreference.org

Results in -70.005868000000007, 41.733080999999999 -> Google Maps