Finding the Fourth Proportional to 129,142.56, 178,225.98 and 72,553.92

Step by Step Solution

1. Step 1: Write the proportion equation
   129,142.56 : 178,225.98 = 72,553.92 : x
2. Step 2: Convert to fraction form
   129,142.56/178,225.98 = 72,553.92/x
3. Step 3: Cross multiply
   129,142.56x = 178,225.98 × 72,553.92
4. Step 4: Simplify right side
   129,142.56x = 12,930,993,494.84
5. Step 5: Solve for x
   x = 12,930,993,494.84/129,142.56
6. Step 6: Final answer
   x = 100,129.60