Step 1:
The first step to converting 408427487.1547 to a fraction is to re-write 408427487.1547 in the form p/q where p and q are both positive integers. To start with, 408427487.1547 can be written as simply 408427487.1547/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 408427487.1547, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 408427487.1547/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 408427487.1547/1 each by 10000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 408427487.1547 as a fraction:
408427487/1 / 1