We look at the division of 18690990 by 393 
Let's see how many times 393 fits into 18690990.

Going ahead to step 1:
If we divide 1 by 393, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 393

Moving on to step 2:
If we divide 18 by 393, we get 0 and a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 18 after subtracting 0 from 18.
Grab the next digit (6) from the dividend, add it to 18, then carry on: 186 / 393

Step 3:
The number 393 fits into 186 0 times, leaving a remainder of 186.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 186 to get 186.
Fetch the next digit (9) from the dividend, attach it to 186 and continue: 1869 / 393

Let's proceed to step 4:
If we divide 1869 by 393, we get 4 and a remainder of 297.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 1572 from 1869 and we're left with 297.
Bring next digit (0) of the dividend behind the 297 and repeat the process: 2970 / 393

Moving on to step 5:
393 goes into 2970 7 times with a remainder of 219.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
If we take 2751 away from 2970, we end up with 219.
Grab the next digit (9) from the dividend, add it to 219, then carry on: 2199 / 393

Advancing to step 6:
When dividing 2199 by 393, we get 5 with a remainder of 234.
Write down 5 as next digit of the result. 
Result so far: 475.0
If we take 1965 away from 2199, we end up with 234.
Append the next digit (9) from the dividend to 234 and continue with: 2349 / 393

Let's proceed to step 7:
393 can be fit into 2349 5 times, resulting in a remainder of 384.
Write down 5 as next digit of the result. 
Result so far: 4755.0
Subtracting 1965 from 2349 leaves us with 384.
Fetch the next digit (0) from the dividend, attach it to 384 and continue: 3840 / 393

Going ahead to step 8:
393 goes into 3840 9 times with a remainder of 303.
Put 9 as the next digit of the answer. 
Result so far: 47559.0
If we subtract 3537 from 3840, we get 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Let's proceed to step 9:
The number 393 fits into 3030 7 times, leaving a remainder of 279.
Record the quotient 7 as the next digit in the result. 
Result so far: 47559.7
If we subtract 2751 from 3030, we get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Going ahead to step 10:
If we divide 2790 by 393, we get 7 and a remainder of 39.
Record the quotient 7 as the next digit in the result. 
Result so far: 47559.77
If we take 2751 away from 2790, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final outcome is 47559.77, with a leftover of 0.039.