Finding the Fourth Proportional to 128,003.18, 176,644.50 and 71,414.57

Step by Step Solution

1. Step 1: Write the proportion equation
   128,003.18 : 176,644.50 = 71,414.57 : x
2. Step 2: Convert to fraction form
   128,003.18/176,644.50 = 71,414.57/x
3. Step 3: Cross multiply
   128,003.18x = 176,644.50 × 71,414.57
4. Step 4: Simplify right side
   128,003.18x = 12,614,991,010.37
5. Step 5: Solve for x
   x = 12,614,991,010.37/128,003.18
6. Step 6: Final answer
   x = 98,552.17