By Bret Kenwell Caterpillar stock is knifing through support. Here’s where it may find its footing. Caterpillar (CAT) – Get Caterpillar Inc. Report shares are taking it on the chin on Friday, down about 6% after the company reported earnings before the open. Unlike Apple (AAPL) – Get Apple Inc. Report, which is rallying on the day, Caterpillar simply can’t seem to find any upside momentum despite reporting a top- and bottom-line beat. However, inflated costs hurt the company’s margins. That said, management expects price hikes to offset those costs in the first quarter of 2022. Still, the stoc…