Finding the Fourth Proportional to 88,009.60, 131,630.40 and 78,716.80

Step by Step Solution

1. Step 1: Write the proportion equation
   88,009.60 : 131,630.40 = 78,716.80 : x
2. Step 2: Convert to fraction form
   88,009.60/131,630.40 = 78,716.80/x
3. Step 3: Cross multiply
   88,009.60x = 131,630.40 × 78,716.80
4. Step 4: Simplify right side
   88,009.60x = 10,361,523,870.72
5. Step 5: Solve for x
   x = 10,361,523,870.72/88,009.60
6. Step 6: Final answer
   x = 117,731.75