Finding the Fourth Proportional to 128,086.40, 176,755.56 and 71,496.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,086.40 : 176,755.56 = 71,496.56 : x
2. Step 2: Convert to fraction form
   128,086.40/176,755.56 = 71,496.56/x
3. Step 3: Cross multiply
   128,086.40x = 176,755.56 × 71,496.56
4. Step 4: Simplify right side
   128,086.40x = 12,637,414,500.87
5. Step 5: Solve for x
   x = 12,637,414,500.87/128,086.40
6. Step 6: Final answer
   x = 98,663.20