Here, our given number is 471z8, which is divisible by 9.

We know that if number is divisible by 9 only when sum of digits of given number is divisible by 9.

Hence, if 471z8 is divisible by 9, then,

4 + 7 + 1 + z + 8 = 0, 9, 18,…

∴ 20 + z = multiple of 9.

Hence, z = (multiple of 9) – 20

Here, possible values for multiples of 9 is 27

Hence, z = 7

∴ Possible number is 47178