Using SketchUp Pro (the commercial version of SketchUp), you can export a SketchUp file (.skp) to the FBX format (.fbx), which is a proprietary Autodesk format. If you do not have access to the program, you have to use some 3rd party alternative or some dedicated converter for skp to fbx conversion.
Open SKP file Open FBX fileA 3D CAD translation software