Finding the Fourth Proportional to 86,559.96, 129,586.86 and 78,259.08

Step by Step Solution

1. Step 1: Write the proportion equation
   86,559.96 : 129,586.86 = 78,259.08 : x
2. Step 2: Convert to fraction form
   86,559.96/129,586.86 = 78,259.08/x
3. Step 3: Cross multiply
   86,559.96x = 129,586.86 × 78,259.08
4. Step 4: Simplify right side
   86,559.96x = 10,141,348,443.69
5. Step 5: Solve for x
   x = 10,141,348,443.69/86,559.96
6. Step 6: Final answer
   x = 117,159.81