Finding the Third Proportional to 129,463.31 and 206,089.31

Step by Step Solution

1. Step 1: Write the proportion equation
   129,463.31 : 206,089.31 = 206,089.31 : x
2. Step 2: Convert to fraction form
   129,463.31/206,089.31 = 206,089.31/x
3. Step 3: Cross multiply
   129,463.31x = 206,089.31 × 206,089.31
4. Step 4: Simplify right side
   129,463.31x = 42,472,804,726.72
5. Step 5: Solve for x
   x = 42,472,804,726.72/129,463.31
6. Step 6: Final answer
   x = 328,068.27