Finding the Third Proportional to 643,012 and 1,396,728

Step by Step Solution

1. Step 1: Write the proportion equation
   643,012 : 1,396,728 = 1,396,728 : x
2. Step 2: Convert to fraction form
   643,012/1,396,728 = 1,396,728/x
3. Step 3: Cross multiply
   643,012x = 1,396,728 × 1,396,728
4. Step 4: Simplify right side
   643,012x = 1,950,849,105,984
5. Step 5: Solve for x
   x = 1,950,849,105,984/643,012
6. Step 6: Final answer
   x = 3,033,923.33