Finding the Third Proportional to 603,661 and 816,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   603,661 : 816,915.50 = 816,915.50 : x
2. Step 2: Convert to fraction form
   603,661/816,915.50 = 816,915.50/x
3. Step 3: Cross multiply
   603,661x = 816,915.50 × 816,915.50
4. Step 4: Simplify right side
   603,661x = 667,350,934,140.25
5. Step 5: Solve for x
   x = 667,350,934,140.25/603,661
6. Step 6: Final answer
   x = 1,105,506.13