Alternative: Articulated tension device (ATD)
A lag screw is not suitable for a transverse fracture. In the illustration, the articulated tension device (ATD) is used to compress the transverse fracture before screws are placed through the plate.
Remember that the wedge fragment has been fixed with a lag screw, as well as by anti-glide effect with the plate, before axial compression is applied. A bicortical screw attaching the plate to the intermediate fragment might be considered for additional stability before compressing the proximal fracture.