Two features in SOLIDWORKS. I was trying for one feature but it didn't work like I hoped. Maybe you'll think of an alternative solution.
Dimensions are not important, but the highlighted angle is critical if going for accuracy.
Warning! Spoilers ahead:
Nice. SW has a Knit command. Knit will merge the faces/bodies, but it will leave each surface in the feature tree as whatever feature was used to create it (Boundary, Planar, Loft...). You and Inventor win this challenge :)
CadCloud has a great solution in Inventor.
I think two steps are required in SOLIDWORKS. This is one solution with using extrusions and 3D sketches: