This option often fails with complex meshes, and can have no separated shells and only one boundary:
A] Select all>Convert To>Open Part>Meshmix>MyParts>Click and drag onto your location
This option will not be perfectly 'curved', but you and curve it manually then extrude a base downward
B] Select about 1/4 of one side of the object>Soft Transform and set falloff the the half way point of the object>rotate the widget to deform one half into the curvature your desire>repeat on the other half>Select the bottom ring of of triangles by zooming in very close and double clicking on a single triangle>Transform and pull the arrow down. If you want it exact without the base sticking through then try the boolean tools.
