Finding the Third Proportional to 685,360 and 1,485,128

Step by Step Solution

1. Step 1: Write the proportion equation
   685,360 : 1,485,128 = 1,485,128 : x
2. Step 2: Convert to fraction form
   685,360/1,485,128 = 1,485,128/x
3. Step 3: Cross multiply
   685,360x = 1,485,128 × 1,485,128
4. Step 4: Simplify right side
   685,360x = 2,205,605,176,384
5. Step 5: Solve for x
   x = 2,205,605,176,384/685,360
6. Step 6: Final answer
   x = 3,218,170.27