Step 1:
The first step to converting 420339883.129 to a fraction is to re-write 420339883.129 in the form p/q where p and q are both positive integers. To start with, 420339883.129 can be written as simply 420339883.129/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 420339883.129, which in this case is 3. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 420339883.129/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 420339883.129/1 each by 1000:
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 420339883.129 as a fraction:
420339883/1 / 1