Finding the Third Proportional to 339,657 and 726,880.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,657 : 726,880.50 = 726,880.50 : x
2. Step 2: Convert to fraction form
   339,657/726,880.50 = 726,880.50/x
3. Step 3: Cross multiply
   339,657x = 726,880.50 × 726,880.50
4. Step 4: Simplify right side
   339,657x = 528,355,261,280.25
5. Step 5: Solve for x
   x = 528,355,261,280.25/339,657
6. Step 6: Final answer
   x = 1,555,555.34