Finding the Third Proportional to 685,422 and 1,485,243

Step by Step Solution

1. Step 1: Write the proportion equation
   685,422 : 1,485,243 = 1,485,243 : x
2. Step 2: Convert to fraction form
   685,422/1,485,243 = 1,485,243/x
3. Step 3: Cross multiply
   685,422x = 1,485,243 × 1,485,243
4. Step 4: Simplify right side
   685,422x = 2,205,946,769,049
5. Step 5: Solve for x
   x = 2,205,946,769,049/685,422
6. Step 6: Final answer
   x = 3,218,377.54