643288 ÷ 4 
We want to figure out the number of times 643288 can be divided by 4.

Step 1:
4 goes into 6 1 times with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 4 from 6, we get 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 4

Moving on to step 2:
24 divided by 4 is 6 with a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Subtract 24 from 24 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 4

Let's proceed to step 3:
When dividing 3 by 4, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 160.0
If we subtract 0 from 3, we get 3.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 4

Step 4:
The number 4 fits into 32 8 times, leaving a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 1608.0
Subtract 32 from 32 to get 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 4

Going ahead to step 5:
4 goes into 8 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 16082.0
Deduct 8 from 8 and we're left with 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 4

Moving on to step 6:
The number 4 fits into 8 2 times, leaving a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 160822.0
Subtracting 8 from 8 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.

Advancing to step 7:
4 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 160822.0
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.

Let's proceed to step 8:
If we divide 0 by 4, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 160822.0
Subtract 0 from 0 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.

After the division, we end up with 160822.0 and a remainder of 0.0.