Finding the Fourth Proportional to 129,123.23, 178,189.88 and 71,760.72

Step by Step Solution

1. Step 1: Write the proportion equation
   129,123.23 : 178,189.88 = 71,760.72 : x
2. Step 2: Convert to fraction form
   129,123.23/178,189.88 = 71,760.72/x
3. Step 3: Cross multiply
   129,123.23x = 178,189.88 × 71,760.72
4. Step 4: Simplify right side
   129,123.23x = 12,787,034,394.92
5. Step 5: Solve for x
   x = 12,787,034,394.92/129,123.23
6. Step 6: Final answer
   x = 99,029.70