In a formal letter, the elements are typically arranged in a specific order for a professional and organized presentation. Here's the reasoning for the order:

1. Date: The date is placed at the very beginning of a formal letter. This is important for record-keeping and for indicating when the letter was written.

2. Receiver's Address:  Following the date, the receiver's address is included. This helps ensure that the letter is directed to the correct recipient.

3. Salutation:  After the receiver's address, the salutation is included. This is the greeting that addresses the recipient in a polite and formal manner.

4. Subject: The subject is included after the salutation. It provides a brief indication of the purpose or topic of the letter.