Finding the Fourth Proportional to 129,081.16, 178,131.30 and 72,492.52

Step by Step Solution

1. Step 1: Write the proportion equation
   129,081.16 : 178,131.30 = 72,492.52 : x
2. Step 2: Convert to fraction form
   129,081.16/178,131.30 = 72,492.52/x
3. Step 3: Cross multiply
   129,081.16x = 178,131.30 × 72,492.52
4. Step 4: Simplify right side
   129,081.16x = 12,913,186,827.88
5. Step 5: Solve for x
   x = 12,913,186,827.88/129,081.16
6. Step 6: Final answer
   x = 100,039.28