Step 1:
The first step to converting 408499.089909 to a fraction is to re-write 408499.089909 in the form p/q where p and q are both positive integers. To start with, 408499.089909 can be written as simply 408499.089909/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 408499.089909, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 408499.089909/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 408499.089909/1 each by 1000000:
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 408499.089909 as a fraction:
408499/1 / 1