Finding the Fourth Proportional to 129,399.50, 178,574.04 and 72,810.88

Step by Step Solution

1. Step 1: Write the proportion equation
   129,399.50 : 178,574.04 = 72,810.88 : x
2. Step 2: Convert to fraction form
   129,399.50/178,574.04 = 72,810.88/x
3. Step 3: Cross multiply
   129,399.50x = 178,574.04 × 72,810.88
4. Step 4: Simplify right side
   129,399.50x = 13,002,132,997.56
5. Step 5: Solve for x
   x = 13,002,132,997.56/129,399.50
6. Step 6: Final answer
   x = 100,480.55