Riverbed Corporation engaged in the following cash transactions during 2017 Sale of land and building Purchase of treasury stock Purchase of land Payment of cash dividend Purchase of equipment Issuance of common stock Retirement of bonds $188,600 41,300 44,400 87,000 61,100 147,400 108,200 Determine Riverbed's free cash flow, assuming that it reported net cash provided by operating activities of $407,870