Finding the Third Proportional to 685,564 and 1,485,540

Step by Step Solution

1. Step 1: Write the proportion equation
   685,564 : 1,485,540 = 1,485,540 : x
2. Step 2: Convert to fraction form
   685,564/1,485,540 = 1,485,540/x
3. Step 3: Cross multiply
   685,564x = 1,485,540 × 1,485,540
4. Step 4: Simplify right side
   685,564x = 2,206,829,091,600
5. Step 5: Solve for x
   x = 2,206,829,091,600/685,564
6. Step 6: Final answer
   x = 3,218,997.92