Finding the Third Proportional to 339,966 and 720,310.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,966 : 720,310.50 = 720,310.50 : x
2. Step 2: Convert to fraction form
   339,966/720,310.50 = 720,310.50/x
3. Step 3: Cross multiply
   339,966x = 720,310.50 × 720,310.50
4. Step 4: Simplify right side
   339,966x = 518,847,216,410.25
5. Step 5: Solve for x
   x = 518,847,216,410.25/339,966
6. Step 6: Final answer
   x = 1,526,173.84