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. We've got a simple 5step process to help you craft your letter.Below, you'll also find 3 unique templates with an example proposal letter for each. Problem Statement: Clearly define the problem or need that your proposal addresses. This website has a great example of a business letter format. Finally, remember your goal. How do you introduce yourself in a proposal letter? Want to write a formal business proposal? Get a step-by-step guide, with free business proposal examples and templates. Instantly draft and send a business proposal template to establish the terms and conditions between your business and clients.