I have a flat sheet metal part that I need to put a large radius bend in.  I'm looking at 318.41831366 radius.  The part is 49.5 long by 25 tall.  Whats the best way to do this?  My thought was to sketch bend and put the large radius in.  That doesn't work so I'm looking for other options.

The sketch line is where I would like the center of the large radius to be.  Then I would like to have the complete part with the bend.