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. Proposal boilerplate and templates.Wayne State University invites you to participate in its Request for Proposal process to provide RFP Document Shredding. A great letter covers the introduction, intention, problem, solution, benefits, potential risks, timeline and budget, USP, and call to action. Here are some steps to help you draft a proposal to a company to buy your food: 1. To write a proposal letter, follow these simple steps. Alongside our guidelines, we also offer proposal letter templates and examples. The resources provided on this page will help you find the necessary and important information needed for submission. A business proposal letter is a document sent to a prospective client or partner, introducing your services or requesting an opportunity. Duly authorized to engage in the insurance business in the State of Michigan.