Finding the Third Proportional to 131,590.50 and 289,419

Step by Step Solution

1. Step 1: Write the proportion equation
   131,590.50 : 289,419 = 289,419 : x
2. Step 2: Convert to fraction form
   131,590.50/289,419 = 289,419/x
3. Step 3: Cross multiply
   131,590.50x = 289,419 × 289,419
4. Step 4: Simplify right side
   131,590.50x = 83,763,357,561
5. Step 5: Solve for x
   x = 83,763,357,561/131,590.50
6. Step 6: Final answer
   x = 636,545.63