Finding the Third Proportional to 54,470.25 and 128,789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   54,470.25 : 128,789.72 = 128,789.72 : x
2. Step 2: Convert to fraction form
   54,470.25/128,789.72 = 128,789.72/x
3. Step 3: Cross multiply
   54,470.25x = 128,789.72 × 128,789.72
4. Step 4: Simplify right side
   54,470.25x = 16,586,791,655.70
5. Step 5: Solve for x
   x = 16,586,791,655.70/54,470.25
6. Step 6: Final answer
   x = 304,511.02