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Recalling Forgotten Bank Account Number

**What were the clues?**
Let x be that missing digit. Then the bank account number looks like, **3170x4847.**
Now 9 x First Digit + 8 x Second Digit + 7 x Third Digit.......must be **divisible** by** 11**.
That is 27 + 8 + 49 + 0 + 5x + 16 + 24 + 8 + 7 = **139 + 5x **must be divisible by 11.
The only value of x as a digit the satisfies above is **3.** With that, total sum** 154** is divisible by 11.
Hence, the account number must be, **317034847.**

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