Step 1:
The first step to converting 8427121.6635663 to a fraction is to re-write 8427121.6635663 in the form p/q where p and q are both positive integers. To start with, 8427121.6635663 can be written as simply 8427121.6635663/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 8427121.6635663, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 8427121.6635663/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 8427121.6635663/1 each by 10000000:
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 8427121.6635663 as a fraction:
8427121/1 / 1