Finding the Third Proportional to 339,660 and 726,886.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,660 : 726,886.50 = 726,886.50 : x
2. Step 2: Convert to fraction form
   339,660/726,886.50 = 726,886.50/x
3. Step 3: Cross multiply
   339,660x = 726,886.50 × 726,886.50
4. Step 4: Simplify right side
   339,660x = 528,363,983,882.25
5. Step 5: Solve for x
   x = 528,363,983,882.25/339,660
6. Step 6: Final answer
   x = 1,555,567.28