One option using 2012 is to use the LOFT command. Another option might be to Extrude with a taper. A third approach might involve using the Slice command and Surface option. Many ways to skin a cat.
LOFT with PATH option definitely works. See image in post below. I used two profiles (one for each end).
look at this picture:
http://www.cadforum.cz/forum_en/uploads/20110518_150639_Curved_ramp.jpg
