54197391 divided by 15 
We want to figure out the number of times 54197391 can be divided by 15.

Moving on to step 1:
If we divide 5 by 15, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 15

Going ahead to step 2:
If we divide 54 by 15, we get 3 and a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 45 away from 54, we end up with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 15

Moving on to step 3:
If we divide 91 by 15, we get 6 and a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 36.0
The remainder is 1 after subtracting 90 from 91.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 15

Step 4:
The number 15 fits into 19 1 times, leaving a remainder of 4.
The next digit of our result is 1. 
Result so far: 361.0
If we subtract 15 from 19, we get 4.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 15

Going ahead to step 5:
15 can be fit into 47 3 times, resulting in a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 3613.0
Deduct 45 from 47 and we're left with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 15

Advancing to step 6:
If we divide 23 by 15, we get 1 and a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 36131.0
The remainder is 8 after subtracting 15 from 23.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 15

Moving on to step 7:
15 goes into 89 5 times with a remainder of 14.
The next digit of our result is 5. 
Result so far: 361315.0
Subtract 75 from 89 to get 14.
Append the next digit (1) from the dividend to 14 and continue with: 141 / 15

On to step 8:
141 divided by 15 is 9 with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 3613159.0
Subtract 135 from 141 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
The number 15 fits into 60 4 times, leaving a remainder of 0.
The next digit of our result is 4. 
Result so far: 3613159.4
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
15 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3613159.4
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 11:
0 divided by 15 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3613159.4
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 3613159.4 with a remainder of 0.0.