There is a minor error in your next-to-last product: 4 days at 4616 = 17664, which reduces your ADB by 0.10 to $3620.43.
If your discrepancy is more serious than that, perhaps it is because of the way you count days in the billing cycle. Counting the billing date as part of the previous billing cycle changes your day counts to 2, 11, 3, 4, 10, and your ADB to $3680.20.