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. After much consideration, King's Square is delighted to accept your proposal to build the new health center.Knowing how to politely accept a business offer over email can be a bit tricky, but we have templates to help. 'Madam' or 'May it please Your Majesty'. Learn how to write a business proposal in simple 10 steps. Based on our research and analysis of over 1.8 million proposals. Customize and Download this "Proposal Acceptance Letter". I am writing to confirm my acceptance of your employment offer on April 20 and to tell you how delighted I am to be joining XYZ Corporation in Chicago. It's important that you follow the required application process and provide all the information we need to assess your application. CLO 2 Write a formal business report using APA format.