Finding the Third Proportional to 685,428 and 1,485,256

Step by Step Solution

1. Step 1: Write the proportion equation
   685,428 : 1,485,256 = 1,485,256 : x
2. Step 2: Convert to fraction form
   685,428/1,485,256 = 1,485,256/x
3. Step 3: Cross multiply
   685,428x = 1,485,256 × 1,485,256
4. Step 4: Simplify right side
   685,428x = 2,205,985,385,536
5. Step 5: Solve for x
   x = 2,205,985,385,536/685,428
6. Step 6: Final answer
   x = 3,218,405.70