Not a tool (I don't know of one in existence that would let you do that), but check out @mkennedy's reply@mkennedy's reply to How would I convert this point to WKID 4326?How would I convert this point to WKID 4326?. She explains how she arrived at the correct spatial reference. SpatialReference.org and patience will be your friends.
Additionally, Esri provides a guide on how to guess a coordinate system (though I prefer mkennedy's method if you know a bit more about the data).