90428509 ÷ 903 
Our goal is to divide 90428509 by 903.

Step 1:
When dividing 9 by 903, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 903

Advancing to step 2:
When dividing 90 by 903, we get 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Bring next digit (4) of the dividend behind the 90 and repeat the process: 904 / 903

Advancing to step 3:
When dividing 904 by 903, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 903 away from 904, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 903

Advancing to step 4:
903 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 903

Going ahead to step 5:
903 can be fit into 128 0 times, resulting in a remainder of 128.
Use 0 as the next digit of our solution. 
Result so far: 100.0
If we subtract 0 from 128, we get 128.
Take the next digit (5) from the dividend and append it to 128, then repeat: 1285 / 903

Advancing to step 6:
When dividing 1285 by 903, we get 1 with a remainder of 382.
The number 1 becomes the next digit in our result. 
Result so far: 1001.0
Subtracting 903 from 1285 leaves us with 382.
Bring next digit (0) of the dividend behind the 382 and repeat the process: 3820 / 903

Step 7:
The number 903 fits into 3820 4 times, leaving a remainder of 208.
Write down 4 as next digit of the result. 
Result so far: 10014.0
Subtracting 3612 from 3820 leaves us with 208.
Take the next digit (9) from the dividend and append it to 208, then repeat: 2089 / 903

On to step 8:
2089 divided by 903 is 2 with a remainder of 283.
Use 2 as the next digit of our solution. 
Result so far: 100142.0
If we take 1806 away from 2089, we end up with 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Moving on to step 9:
903 can be fit into 2830 3 times, resulting in a remainder of 121.
Record the quotient 3 as the next digit in the result. 
Result so far: 100142.3
If we take 2709 away from 2830, we end up with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Moving on to step 10:
1210 divided by 903 is 1 with a remainder of 307.
Record the quotient 1 as the next digit in the result. 
Result so far: 100142.31
Subtracting 903 from 1210 leaves us with 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Let's proceed to step 11:
The number 903 fits into 3070 3 times, leaving a remainder of 361.
Write down 3 as next digit of the result. 
Result so far: 100142.313
The remainder is 361 after subtracting 2709 from 3070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

Advancing to step 12:
3610 divided by 903 is 3 with a remainder of 901.
Write down 3 as next digit of the result. 
Result so far: 100142.3133
If we take 2709 away from 3610, we end up with 901.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9010, and continue the process.

In conclusion, the division gives 100142.3133 with a balance of 0.00901.