Step 1:
The first step to converting 870159.4200065 to a fraction is to re-write 870159.4200065 in the form p/q where p and q are both positive integers. To start with, 870159.4200065 can be written as simply 870159.4200065/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 870159.4200065, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 870159.4200065/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 870159.4200065/1 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 870159.4200065 as a fraction:
870159/1 / 1