Finding the Fourth Proportional to 129,522.72, 178,750.50 and 72,165.81

Step by Step Solution

1. Step 1: Write the proportion equation
   129,522.72 : 178,750.50 = 72,165.81 : x
2. Step 2: Convert to fraction form
   129,522.72/178,750.50 = 72,165.81/x
3. Step 3: Cross multiply
   129,522.72x = 178,750.50 × 72,165.81
4. Step 4: Simplify right side
   129,522.72x = 12,899,674,620.41
5. Step 5: Solve for x
   x = 12,899,674,620.41/129,522.72
6. Step 6: Final answer
   x = 99,593.91