Finding the Third Proportional to 685,434 and 1,485,258

Step by Step Solution

1. Step 1: Write the proportion equation
   685,434 : 1,485,258 = 1,485,258 : x
2. Step 2: Convert to fraction form
   685,434/1,485,258 = 1,485,258/x
3. Step 3: Cross multiply
   685,434x = 1,485,258 × 1,485,258
4. Step 4: Simplify right side
   685,434x = 2,205,991,326,564
5. Step 5: Solve for x
   x = 2,205,991,326,564/685,434
6. Step 6: Final answer
   x = 3,218,386.20