89553431 ÷ 399 
We want to figure out the number of times 89553431 can be divided by 399.

Moving on to step 1:
399 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 399

Step 2:
399 goes into 89 0 times with a remainder of 89.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 89 to get 89.
Append the next digit (5) from the dividend to 89 and continue with: 895 / 399

Going ahead to step 3:
399 goes into 895 2 times with a remainder of 97.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 798 from 895 to get 97.
Bring next digit (5) of the dividend behind the 97 and repeat the process: 975 / 399

On to step 4:
The number 399 fits into 975 2 times, leaving a remainder of 177.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
Subtracting 798 from 975 leaves us with 177.
Include the next digit (3) from the dividend after 177, then repeat: 1773 / 399

Moving on to step 5:
399 goes into 1773 4 times with a remainder of 177.
Write down 4 as next digit of the result. 
Result so far: 224.0
If we take 1596 away from 1773, we end up with 177.
Grab the next digit (4) from the dividend, add it to 177, then carry on: 1774 / 399

Let's proceed to step 6:
The number 399 fits into 1774 4 times, leaving a remainder of 178.
Use 4 as the next digit of our solution. 
Result so far: 2244.0
Deduct 1596 from 1774 and we're left with 178.
Take the next digit (3) from the dividend and append it to 178, then repeat: 1783 / 399

Moving on to step 7:
1783 divided by 399 is 4 with a remainder of 187.
Write down 4 as next digit of the result. 
Result so far: 22444.0
Deduct 1596 from 1783 and we're left with 187.
Fetch the next digit (1) from the dividend, attach it to 187 and continue: 1871 / 399

Advancing to step 8:
The number 399 fits into 1871 4 times, leaving a remainder of 275.
The number 4 becomes the next digit in our result. 
Result so far: 224444.0
Deduct 1596 from 1871 and we're left with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Let's proceed to step 9:
If we divide 2750 by 399, we get 6 and a remainder of 356.
Write down 6 as next digit of the result. 
Result so far: 224444.6
Subtracting 2394 from 2750 leaves us with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Moving on to step 10:
399 can be fit into 3560 8 times, resulting in a remainder of 368.
Put 8 as the next digit of the answer. 
Result so far: 224444.68
Subtracting 3192 from 3560 leaves us with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Going ahead to step 11:
If we divide 3680 by 399, we get 9 and a remainder of 89.
Put 9 as the next digit of the answer. 
Result so far: 224444.689
Subtracting 3591 from 3680 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

On to step 12:
399 goes into 890 2 times with a remainder of 92.
Use 2 as the next digit of our solution. 
Result so far: 224444.6892
The remainder is 92 after subtracting 798 from 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Let's proceed to step 13:
920 divided by 399 is 2 with a remainder of 122.
Record the quotient 2 as the next digit in the result. 
Result so far: 224444.68922
The remainder is 122 after subtracting 798 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

The final result is 224444.68922 with a remainder of 0.000122.