In this article, we discuss how to write a business proposal letter and we offer sample letters and templates you can use as a guide. This website has a great example of a business letter format.Finally, remember your goal. Instantly draft and send a business proposal template to establish the terms and conditions between your business and clients. We'll outline basic formatting techniques that can be used thoughtfully and strategically to strengthen your proposal. Key Personnel Proposal. Answer all questions thoroughly in the spaces provided. A Business Proposal can also be used in the process of seeking funding from investors to support a specific business need. A letter of intent is a proposal describing and explaining your intentions. Does the project support the mission of the University of Arizona?