43546639 divided by 686 
We want to divide 43546639 by 686.

Let's proceed to step 1:
The number 686 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 686

On to step 2:
43 divided by 686 is 0 with a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Include the next digit (5) from the dividend after 43, then repeat: 435 / 686

Moving on to step 3:
686 goes into 435 0 times with a remainder of 435.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 435 leaves us with 435.
Fetch the next digit (4) from the dividend, attach it to 435 and continue: 4354 / 686

On to step 4:
The number 686 fits into 4354 6 times, leaving a remainder of 238.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtract 4116 from 4354 to get 238.
Fetch the next digit (6) from the dividend, attach it to 238 and continue: 2386 / 686

On to step 5:
If we divide 2386 by 686, we get 3 and a remainder of 328.
Put 3 as the next digit of the answer. 
Result so far: 63.0
If we subtract 2058 from 2386, we get 328.
Grab the next digit (6) from the dividend, add it to 328, then carry on: 3286 / 686

Step 6:
If we divide 3286 by 686, we get 4 and a remainder of 542.
Use 4 as the next digit of our solution. 
Result so far: 634.0
If we subtract 2744 from 3286, we get 542.
Grab the next digit (3) from the dividend, add it to 542, then carry on: 5423 / 686

Going ahead to step 7:
If we divide 5423 by 686, we get 7 and a remainder of 621.
Use 7 as the next digit of our solution. 
Result so far: 6347.0
Deduct 4802 from 5423 and we're left with 621.
Fetch the next digit (9) from the dividend, attach it to 621 and continue: 6219 / 686

Let's proceed to step 8:
686 can be fit into 6219 9 times, resulting in a remainder of 45.
Use 9 as the next digit of our solution. 
Result so far: 63479.0
The remainder is 45 after subtracting 6174 from 6219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 9:
The number 686 fits into 450 0 times, leaving a remainder of 450.
The next digit of our result is 0. 
Result so far: 63479.0
Subtracting 0 from 450 leaves us with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Advancing to step 10:
686 goes into 4500 6 times with a remainder of 384.
The next digit of our result is 6. 
Result so far: 63479.06
Deduct 4116 from 4500 and we're left with 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Moving on to step 11:
3840 divided by 686 is 5 with a remainder of 410.
Write down 5 as next digit of the result. 
Result so far: 63479.065
Subtracting 3430 from 3840 leaves us with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Moving on to step 12:
The number 686 fits into 4100 5 times, leaving a remainder of 670.
Record the quotient 5 as the next digit in the result. 
Result so far: 63479.0655
If we take 3430 away from 4100, we end up with 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

The final outcome is 63479.0655, with a leftover of 0.0067.