First we move the divisor (if its a decimal) to the right until there is no more dot. If your dividend is also a decimal you also need to move it to the right how many spaces you moved the divisor's.
Example:
923.56 ÷ 4.5
This means that we move the dot between 4 and 5 once. We do the same to 923.56.
This means our division problem will be
9235.6 ÷ 45.
Now just do the problem normally as you should.