If you would like to acknowledge the receipt of a feasibility study, here is a simple template that you can use to write an acknowledgement letter for a feasibility study.
This letter acknowledges the feasibility study conducted for the project titled [project name]. The study reaches into the depths of the said topic, and without it, this project assessment would not be possible. Ample time was given to the research and the analysis for this study, and we are extremely grateful for it.
Thank you for your efforts, they are appreciated.