We're dividing 91724869 by 399 
We want to figure out the number of times 91724869 can be divided by 399.

Let's proceed to step 1:
399 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 399

Advancing to step 2:
399 can be fit into 91 0 times, resulting in a remainder of 91.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Grab the next digit (7) from the dividend, add it to 91, then carry on: 917 / 399

On to step 3:
When dividing 917 by 399, we get 2 with a remainder of 119.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 798 away from 917, we end up with 119.
Bring next digit (2) of the dividend behind the 119 and repeat the process: 1192 / 399

Step 4:
399 can be fit into 1192 2 times, resulting in a remainder of 394.
The next digit of our result is 2. 
Result so far: 22.0
The remainder is 394 after subtracting 798 from 1192.
Bring next digit (4) of the dividend behind the 394 and repeat the process: 3944 / 399

Step 5:
The number 399 fits into 3944 9 times, leaving a remainder of 353.
Write down 9 as next digit of the result. 
Result so far: 229.0
Deduct 3591 from 3944 and we're left with 353.
Grab the next digit (8) from the dividend, add it to 353, then carry on: 3538 / 399

Let's proceed to step 6:
3538 divided by 399 is 8 with a remainder of 346.
The number 8 becomes the next digit in our result. 
Result so far: 2298.0
Subtract 3192 from 3538 to get 346.
Grab the next digit (6) from the dividend, add it to 346, then carry on: 3466 / 399

Step 7:
The number 399 fits into 3466 8 times, leaving a remainder of 274.
Record the quotient 8 as the next digit in the result. 
Result so far: 22988.0
If we take 3192 away from 3466, we end up with 274.
Fetch the next digit (9) from the dividend, attach it to 274 and continue: 2749 / 399

Advancing to step 8:
The number 399 fits into 2749 6 times, leaving a remainder of 355.
Write down 6 as next digit of the result. 
Result so far: 229886.0
If we subtract 2394 from 2749, we 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.

Moving on to step 9:
399 can be fit into 3550 8 times, resulting in a remainder of 358.
Record the quotient 8 as the next digit in the result. 
Result so far: 229886.8
Subtract 3192 from 3550 to get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Moving on to step 10:
When dividing 3580 by 399, we get 8 with a remainder of 388.
The next digit of our result is 8. 
Result so far: 229886.88
If we subtract 3192 from 3580, we get 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

The final outcome is 229886.88, with a leftover of 0.388.