At the end of 2021, Marin Co. has accounts receivable of $767,100 and an allowance for doubtful accounts of $23,810. On January 24, 2022, it is learned that the company's receivable from Madonna Inc. is not collectible and therefore management authorizes a write-off of $4,451. what is the cash realizable value of the accounts receivable before the write-off and after the write-off?