Finding the Third Proportional to 685,416 and 1,485,240

Step by Step Solution

1. Step 1: Write the proportion equation
   685,416 : 1,485,240 = 1,485,240 : x
2. Step 2: Convert to fraction form
   685,416/1,485,240 = 1,485,240/x
3. Step 3: Cross multiply
   685,416x = 1,485,240 × 1,485,240
4. Step 4: Simplify right side
   685,416x = 2,205,937,857,600
5. Step 5: Solve for x
   x = 2,205,937,857,600/685,416
6. Step 6: Final answer
   x = 3,218,392.71