Finding the Fourth Proportional to 86,754.25, 129,402.12 and 78,781.42

Step by Step Solution

1. Step 1: Write the proportion equation
   86,754.25 : 129,402.12 = 78,781.42 : x
2. Step 2: Convert to fraction form
   86,754.25/129,402.12 = 78,781.42/x
3. Step 3: Cross multiply
   86,754.25x = 129,402.12 × 78,781.42
4. Step 4: Simplify right side
   86,754.25x = 10,194,482,764.61
5. Step 5: Solve for x
   x = 10,194,482,764.61/86,754.25
6. Step 6: Final answer
   x = 117,509.89