Very unlikely. The HX15, besides requiring 55 PTO hp, is far too heavy to be used safely with your 4720.
First - overall weight of the HX15 is far greater than your 4720 - even with max ballast you'd have a heavy tail wagging your dog. The HX15 weighs 5250 lbs.
Second- static drawbar vertical (tongue) weight is nearly twice what your drawbar is rated for - 1920 lbs vs. around 1100 lbs.
You are into a 6000 series tractor or bigger to run that big of a cutter successfully. Lot of folks out there doing just that cutting Interstate medians and the like.