91660709 ÷ 678 
Our goal is to divide 91660709 by 678.

Advancing to step 1:
9 divided by 678 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 678

Advancing to step 2:
678 goes into 91 0 times with a remainder of 91.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Take the next digit (6) from the dividend and append it to 91, then repeat: 916 / 678

On to step 3:
678 goes into 916 1 times with a remainder of 238.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 678 from 916 to get 238.
Append the next digit (6) from the dividend to 238 and continue with: 2386 / 678

On to step 4:
678 goes into 2386 3 times with a remainder of 352.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
The remainder is 352 after subtracting 2034 from 2386.
Take the next digit (0) from the dividend and append it to 352, then repeat: 3520 / 678

Moving on to step 5:
678 goes into 3520 5 times with a remainder of 130.
Write down 5 as next digit of the result. 
Result so far: 135.0
Subtract 3390 from 3520 to get 130.
Take the next digit (7) from the dividend and append it to 130, then repeat: 1307 / 678

Advancing to step 6:
The number 678 fits into 1307 1 times, leaving a remainder of 629.
The number 1 becomes the next digit in our result. 
Result so far: 1351.0
If we subtract 678 from 1307, we get 629.
Include the next digit (0) from the dividend after 629, then repeat: 6290 / 678

Going ahead to step 7:
The number 678 fits into 6290 9 times, leaving a remainder of 188.
The next digit of our result is 9. 
Result so far: 13519.0
Subtracting 6102 from 6290 leaves us with 188.
Take the next digit (9) from the dividend and append it to 188, then repeat: 1889 / 678

Step 8:
When dividing 1889 by 678, we get 2 with a remainder of 533.
Record the quotient 2 as the next digit in the result. 
Result so far: 135192.0
If we subtract 1356 from 1889, we get 533.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5330, and continue the process.

Going ahead to step 9:
678 can be fit into 5330 7 times, resulting in a remainder of 584.
Use 7 as the next digit of our solution. 
Result so far: 135192.7
If we take 4746 away from 5330, we end up with 584.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

On to step 10:
When dividing 5840 by 678, we get 8 with a remainder of 416.
Write down 8 as next digit of the result. 
Result so far: 135192.78
Subtract 5424 from 5840 to get 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Going ahead to step 11:
678 can be fit into 4160 6 times, resulting in a remainder of 92.
The number 6 becomes the next digit in our result. 
Result so far: 135192.786
The remainder is 92 after subtracting 4068 from 4160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Step 12:
The number 678 fits into 920 1 times, leaving a remainder of 242.
The next digit of our result is 1. 
Result so far: 135192.7861
Subtract 678 from 920 to get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

On to step 13:
678 can be fit into 2420 3 times, resulting in a remainder of 386.
The number 3 becomes the next digit in our result. 
Result so far: 135192.78613
If we subtract 2034 from 2420, we get 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Step 14:
678 can be fit into 3860 5 times, resulting in a remainder of 470.
The next digit of our result is 5. 
Result so far: 135192.786135
If we subtract 3390 from 3860, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Let's proceed to step 15:
678 goes into 4700 6 times with a remainder of 632.
Use 6 as the next digit of our solution. 
Result so far: 135192.7861356
If we take 4068 away from 4700, we end up with 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Step 16:
When dividing 6320 by 678, we get 9 with a remainder of 218.
Put 9 as the next digit of the answer. 
Result so far: 135192.78613569
If we take 6102 away from 6320, we end up with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

The final outcome is 135192.78613569, with a leftover of 2.18e-07.