Finding the Third Proportional to 250,915.50 and 357,689

Step by Step Solution

1. Step 1: Write the proportion equation
   250,915.50 : 357,689 = 357,689 : x
2. Step 2: Convert to fraction form
   250,915.50/357,689 = 357,689/x
3. Step 3: Cross multiply
   250,915.50x = 357,689 × 357,689
4. Step 4: Simplify right side
   250,915.50x = 127,941,420,721
5. Step 5: Solve for x
   x = 127,941,420,721/250,915.50
6. Step 6: Final answer
   x = 509,898.43