We look at the division of 78436399 by 663 
We want to figure out the number of times 78436399 can be divided by 663.

Going ahead to step 1:
The number 663 fits into 7 0 times, leaving a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 663

Moving on to step 2:
If we divide 78 by 663, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Take the next digit (4) from the dividend and append it to 78, then repeat: 784 / 663

Going ahead to step 3:
The number 663 fits into 784 1 times, leaving a remainder of 121.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 663 away from 784, we end up with 121.
Grab the next digit (3) from the dividend, add it to 121, then carry on: 1213 / 663

Moving on to step 4:
663 can be fit into 1213 1 times, resulting in a remainder of 550.
Write down 1 as next digit of the result. 
Result so far: 11.0
Deduct 663 from 1213 and we're left with 550.
Take the next digit (6) from the dividend and append it to 550, then repeat: 5506 / 663

Let's proceed to step 5:
663 can be fit into 5506 8 times, resulting in a remainder of 202.
The number 8 becomes the next digit in our result. 
Result so far: 118.0
If we subtract 5304 from 5506, we get 202.
Take the next digit (3) from the dividend and append it to 202, then repeat: 2023 / 663

Going ahead to step 6:
If we divide 2023 by 663, we get 3 and a remainder of 34.
Put 3 as the next digit of the answer. 
Result so far: 1183.0
If we take 1989 away from 2023, we end up with 34.
Fetch the next digit (9) from the dividend, attach it to 34 and continue: 349 / 663

Advancing to step 7:
If we divide 349 by 663, we get 0 and a remainder of 349.
Use 0 as the next digit of our solution. 
Result so far: 11830.0
Deduct 0 from 349 and we're left with 349.
Fetch the next digit (9) from the dividend, attach it to 349 and continue: 3499 / 663

Moving on to step 8:
663 goes into 3499 5 times with a remainder of 184.
Put 5 as the next digit of the answer. 
Result so far: 118305.0
Subtracting 3315 from 3499 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Let's proceed to step 9:
If we divide 1840 by 663, we get 2 and a remainder of 514.
Record the quotient 2 as the next digit in the result. 
Result so far: 118305.2
Deduct 1326 from 1840 and we're left with 514.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5140, and continue the process.

Step 10:
The number 663 fits into 5140 7 times, leaving a remainder of 499.
The number 7 becomes the next digit in our result. 
Result so far: 118305.27
Subtracting 4641 from 5140 leaves us with 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

On to step 11:
663 goes into 4990 7 times with a remainder of 349.
Write down 7 as next digit of the result. 
Result so far: 118305.277
If we subtract 4641 from 4990, we get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

The final outcome is 118305.277, with a leftover of 0.0349.