Finding the Fourth Proportional to 128,766.52, 177,708.06 and 71,411.54

Step by Step Solution

1. Step 1: Write the proportion equation
   128,766.52 : 177,708.06 = 71,411.54 : x
2. Step 2: Convert to fraction form
   128,766.52/177,708.06 = 71,411.54/x
3. Step 3: Cross multiply
   128,766.52x = 177,708.06 × 71,411.54
4. Step 4: Simplify right side
   128,766.52x = 12,690,405,346.47
5. Step 5: Solve for x
   x = 12,690,405,346.47/128,766.52
6. Step 6: Final answer
   x = 98,553.61