Finding the Third Proportional to 300,728 and 648,472

Step by Step Solution

1. Step 1: Write the proportion equation
   300,728 : 648,472 = 648,472 : x
2. Step 2: Convert to fraction form
   300,728/648,472 = 648,472/x
3. Step 3: Cross multiply
   300,728x = 648,472 × 648,472
4. Step 4: Simplify right side
   300,728x = 420,515,934,784
5. Step 5: Solve for x
   x = 420,515,934,784/300,728
6. Step 6: Final answer
   x = 1,398,326.51