15721264 ÷ 770 
Let's see how many times 770 fits into 15721264.

Moving on to step 1:
When dividing 1 by 770, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 770

Going ahead to step 2:
770 goes into 15 0 times with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Include the next digit (7) from the dividend after 15, then repeat: 157 / 770

Let's proceed to step 3:
When dividing 157 by 770, we get 0 with a remainder of 157.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 157, we end up with 157.
Include the next digit (2) from the dividend after 157, then repeat: 1572 / 770

On to step 4:
770 goes into 1572 2 times with a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 1540 from 1572 leaves us with 32.
Include the next digit (1) from the dividend after 32, then repeat: 321 / 770

Let's proceed to step 5:
770 can be fit into 321 0 times, resulting in a remainder of 321.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Deduct 0 from 321 and we're left with 321.
Fetch the next digit (2) from the dividend, attach it to 321 and continue: 3212 / 770

Let's proceed to step 6:
The number 770 fits into 3212 4 times, leaving a remainder of 132.
Write down 4 as next digit of the result. 
Result so far: 204.0
Subtract 3080 from 3212 to get 132.
Append the next digit (6) from the dividend to 132 and continue with: 1326 / 770

Advancing to step 7:
The number 770 fits into 1326 1 times, leaving a remainder of 556.
Put 1 as the next digit of the answer. 
Result so far: 2041.0
The remainder is 556 after subtracting 770 from 1326.
Grab the next digit (4) from the dividend, add it to 556, then carry on: 5564 / 770

Step 8:
When dividing 5564 by 770, we get 7 with a remainder of 174.
The number 7 becomes the next digit in our result. 
Result so far: 20417.0
Subtracting 5390 from 5564 leaves us with 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Going ahead to step 9:
The number 770 fits into 1740 2 times, leaving a remainder of 200.
Use 2 as the next digit of our solution. 
Result so far: 20417.2
If we take 1540 away from 1740, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 10:
If we divide 2000 by 770, we get 2 and a remainder of 460.
The number 2 becomes the next digit in our result. 
Result so far: 20417.22
The remainder is 460 after subtracting 1540 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

The final result is 20417.22 with a remainder of 0.46.