We look at the division of 491689 by 90 
We're looking to find how many times 90 goes into 491689.

Going ahead to step 1:
90 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 90

Step 2:
The number 90 fits into 49 0 times, leaving a remainder of 49.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 49 and we're left with 49.
Append the next digit (1) from the dividend to 49 and continue with: 491 / 90

Advancing to step 3:
If we divide 491 by 90, we get 5 and a remainder of 41.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 450 from 491 to get 41.
Grab the next digit (6) from the dividend, add it to 41, then carry on: 416 / 90

Going ahead to step 4:
When dividing 416 by 90, we get 4 with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 54.0
If we take 360 away from 416, we end up with 56.
Bring next digit (8) of the dividend behind the 56 and repeat the process: 568 / 90

Advancing to step 5:
When dividing 568 by 90, we get 6 with a remainder of 28.
Put 6 as the next digit of the answer. 
Result so far: 546.0
Deduct 540 from 568 and we're left with 28.
Append the next digit (9) from the dividend to 28 and continue with: 289 / 90

Step 6:
289 divided by 90 is 3 with a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 5463.0
Subtract 270 from 289 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
When dividing 190 by 90, we get 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 5463.2
Subtracting 180 from 190 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
90 can be fit into 100 1 times, resulting in a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 5463.21
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
100 divided by 90 is 1 with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 5463.211
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 5463.211 with a remainder of 0.001.