Finding the Third Proportional to 517,817.50 and 699,605

Step by Step Solution

1. Step 1: Write the proportion equation
   517,817.50 : 699,605 = 699,605 : x
2. Step 2: Convert to fraction form
   517,817.50/699,605 = 699,605/x
3. Step 3: Cross multiply
   517,817.50x = 699,605 × 699,605
4. Step 4: Simplify right side
   517,817.50x = 489,447,156,025
5. Step 5: Solve for x
   x = 489,447,156,025/517,817.50
6. Step 6: Final answer
   x = 945,211.69