Fifty-four-point-zero-three-nine.
Each of these digits by themselves can be read as:
Fifty, four, zero (because this is a decimal you read the zero out), three (because this is a decimal, you read each number after the decimal as a digit in the ones place., nine.
Knowing the value of each place is very important to find the name for each digit.
Once we know the names of the digits, we can string them together to write the number in word form.
