Chimps have approximately 5 times the strength of the average full grown man.
Gorillas are somewhere around 10 to 13 times stronger than the average full grown man (in the upper body, about 5 times stronger in the lower body).
What about Sasquatch?
With reliable footprints (those that contain fingerprint patterns) measuring up to 21 inches in length, Squatch probably get to around 9'6'' tall and weigh more than 1000 lbs... visual sightings seem to confirm this (although 7'-8' tall and 400-700 lbs is more often reported). Add to this the fact that Squatch have been seen beating black bears, deer, elk and even moose to death and you get some idea of the power. I have personally seen trees bent over and twisted around each other in the back woods of Wisconsin and British Columbia... trees beaten so hard with logs (knocking stations) that the wood is splintered in situ and even heard of a 3 tonne truck being lifted onto two wheels in the middle of the night.
Cue the Twillight Zone music...
The Luke