15403483 divided by 399 
We want to divide 15403483 by 399.

Step 1:
399 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 399

Moving on to step 2:
15 divided by 399 is 0 with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 399

Moving on to step 3:
The number 399 fits into 154 0 times, leaving a remainder of 154.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 154 to get 154.
Fetch the next digit (0) from the dividend, attach it to 154 and continue: 1540 / 399

Let's proceed to step 4:
When dividing 1540 by 399, we get 3 with a remainder of 343.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 1197 from 1540, we get 343.
Include the next digit (3) from the dividend after 343, then repeat: 3433 / 399

Going ahead to step 5:
If we divide 3433 by 399, we get 8 and a remainder of 241.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
Subtracting 3192 from 3433 leaves us with 241.
Append the next digit (4) from the dividend to 241 and continue with: 2414 / 399

Going ahead to step 6:
If we divide 2414 by 399, we get 6 and a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 386.0
If we subtract 2394 from 2414, we get 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 399

Step 7:
The number 399 fits into 208 0 times, leaving a remainder of 208.
The next digit of our result is 0. 
Result so far: 3860.0
If we subtract 0 from 208, we get 208.
Grab the next digit (3) from the dividend, add it to 208, then carry on: 2083 / 399

On to step 8:
399 goes into 2083 5 times with a remainder of 88.
Record the quotient 5 as the next digit in the result. 
Result so far: 38605.0
The remainder is 88 after subtracting 1995 from 2083.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Step 9:
399 can be fit into 880 2 times, resulting in a remainder of 82.
Put 2 as the next digit of the answer. 
Result so far: 38605.2
If we take 798 away from 880, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 10:
399 can be fit into 820 2 times, resulting in a remainder of 22.
Put 2 as the next digit of the answer. 
Result so far: 38605.22
Deduct 798 from 820 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

In conclusion, the division gives 38605.22 with a balance of 0.022.