Finding the Fourth Proportional to 129,500.06, 178,709.54 and 72,140.04

Step by Step Solution

1. Step 1: Write the proportion equation
   129,500.06 : 178,709.54 = 72,140.04 : x
2. Step 2: Convert to fraction form
   129,500.06/178,709.54 = 72,140.04/x
3. Step 3: Cross multiply
   129,500.06x = 178,709.54 × 72,140.04
4. Step 4: Simplify right side
   129,500.06x = 12,892,113,003.28
5. Step 5: Solve for x
   x = 12,892,113,003.28/129,500.06
6. Step 6: Final answer
   x = 99,552.95