Let's divide 3891359 by 781
We're looking to find how many times 781 goes into 3891359.

Step 1:
3 divided by 781 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 781

Step 2:
The number 781 fits into 38 0 times, leaving a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 38 leaves us with 38.
Bring next digit (9) of the dividend behind the 38 and repeat the process: 389 / 781

Advancing to step 3:
781 goes into 389 0 times with a remainder of 389.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 389 to get 389.
Take the next digit (1) from the dividend and append it to 389, then repeat: 3891 / 781

Advancing to step 4:
781 can be fit into 3891 4 times, resulting in a remainder of 767.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 3124 from 3891 and we're left with 767.
Take the next digit (3) from the dividend and append it to 767, then repeat: 7673 / 781

On to step 5:
7673 divided by 781 is 9 with a remainder of 644.
Put 9 as the next digit of the answer. 
Result so far: 49.0
The remainder is 644 after subtracting 7029 from 7673.
Bring next digit (5) of the dividend behind the 644 and repeat the process: 6445 / 781

On to step 6:
781 goes into 6445 8 times with a remainder of 197.
The next digit of our result is 8. 
Result so far: 498.0
If we subtract 6248 from 6445, we get 197.
Bring next digit (9) of the dividend behind the 197 and repeat the process: 1979 / 781

Moving on to step 7:
The number 781 fits into 1979 2 times, leaving a remainder of 417.
The next digit of our result is 2. 
Result so far: 4982.0
If we take 1562 away from 1979, we end up with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

Going ahead to step 8:
The number 781 fits into 4170 5 times, leaving a remainder of 265.
Put 5 as the next digit of the answer. 
Result so far: 4982.5
Deduct 3905 from 4170 and we're left with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

On to step 9:
781 can be fit into 2650 3 times, resulting in a remainder of 307.
Put 3 as the next digit of the answer. 
Result so far: 4982.53
Subtracting 2343 from 2650 leaves us with 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Step 10:
3070 divided by 781 is 3 with a remainder of 727.
Write down 3 as next digit of the result. 
Result so far: 4982.533
Deduct 2343 from 3070 and we're left with 727.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7270, and continue the process.

The final result is 4982.533 with a remainder of 0.0727.