We're dividing 90170359 by 731 
We want to figure out the number of times 90170359 can be divided by 731.

On to step 1:
731 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 731

Let's proceed to step 2:
The number 731 fits into 90 0 times, leaving a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Grab the next digit (1) from the dividend, add it to 90, then carry on: 901 / 731

Going ahead to step 3:
The number 731 fits into 901 1 times, leaving a remainder of 170.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 731 away from 901, we end up with 170.
Include the next digit (7) from the dividend after 170, then repeat: 1707 / 731

Moving on to step 4:
731 goes into 1707 2 times with a remainder of 245.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Deduct 1462 from 1707 and we're left with 245.
Include the next digit (0) from the dividend after 245, then repeat: 2450 / 731

Step 5:
If we divide 2450 by 731, we get 3 and a remainder of 257.
The next digit of our result is 3. 
Result so far: 123.0
Subtract 2193 from 2450 to get 257.
Fetch the next digit (3) from the dividend, attach it to 257 and continue: 2573 / 731

Moving on to step 6:
2573 divided by 731 is 3 with a remainder of 380.
The number 3 becomes the next digit in our result. 
Result so far: 1233.0
If we subtract 2193 from 2573, we get 380.
Include the next digit (5) from the dividend after 380, then repeat: 3805 / 731

Advancing to step 7:
3805 divided by 731 is 5 with a remainder of 150.
Use 5 as the next digit of our solution. 
Result so far: 12335.0
If we subtract 3655 from 3805, we get 150.
Include the next digit (9) from the dividend after 150, then repeat: 1509 / 731

Advancing to step 8:
When dividing 1509 by 731, we get 2 with a remainder of 47.
Use 2 as the next digit of our solution. 
Result so far: 123352.0
If we take 1462 away from 1509, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 9:
470 divided by 731 is 0 with a remainder of 470.
The next digit of our result is 0. 
Result so far: 123352.0
Deduct 0 from 470 and we're left with 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Step 10:
If we divide 4700 by 731, we get 6 and a remainder of 314.
The number 6 becomes the next digit in our result. 
Result so far: 123352.06
Deduct 4386 from 4700 and we're left with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Advancing to step 11:
731 goes into 3140 4 times with a remainder of 216.
Write down 4 as next digit of the result. 
Result so far: 123352.064
If we subtract 2924 from 3140, we get 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 12:
731 can be fit into 2160 2 times, resulting in a remainder of 698.
The number 2 becomes the next digit in our result. 
Result so far: 123352.0642
The remainder is 698 after subtracting 1462 from 2160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6980, and continue the process.

Moving on to step 13:
731 can be fit into 6980 9 times, resulting in a remainder of 401.
Record the quotient 9 as the next digit in the result. 
Result so far: 123352.06429
Subtract 6579 from 6980 to get 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Step 14:
731 goes into 4010 5 times with a remainder of 355.
The next digit of our result is 5. 
Result so far: 123352.064295
Subtract 3655 from 4010 to get 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

Let's proceed to step 15:
731 can be fit into 3550 4 times, resulting in a remainder of 626.
The number 4 becomes the next digit in our result. 
Result so far: 123352.0642954
Subtract 2924 from 3550 to get 626.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

On to step 16:
731 can be fit into 6260 8 times, resulting in a remainder of 412.
The next digit of our result is 8. 
Result so far: 123352.06429548
Subtracting 5848 from 6260 leaves us with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

The final result is 123352.06429548 with a remainder of 4.12e-07.