Step 1:
The first step to converting 421635.81563154 to a fraction is to re-write 421635.81563154 in the form p/q where p and q are both positive integers. To start with, 421635.81563154 can be written as simply 421635.81563154/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 421635.81563154, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 421635.81563154/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 421635.81563154/1 each by 100000000:
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 421635.81563154 as a fraction:
421636/1 / 1