Fill out the form; Book a time slot; Attend a demo. 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.Chicago doesn't require a specific font or font size, but recommends using something simple and readable (eg, 12 pt. A letter of commitment indicates the signatory's intent to commit resources to the funded project as specified in the letter, should the proposal be funded. We'll outline basic formatting techniques that can be used thoughtfully and strategically to strengthen your proposal. If you are not using letterhead, include the sender's address at the top of the letter one line above the date. The letter request should not be more than two pages in length. Organizations should be able to sell themselves in the first paragraph. A letter of commitment indicates the signatory's intent to commit resources to the funded project as specified in the letter, should the proposal be funded. Business contract lawyers typically complete the work in nine simple steps.