Finding the Third Proportional to 300,885 and 648,791

Step by Step Solution

1. Step 1: Write the proportion equation
   300,885 : 648,791 = 648,791 : x
2. Step 2: Convert to fraction form
   300,885/648,791 = 648,791/x
3. Step 3: Cross multiply
   300,885x = 648,791 × 648,791
4. Step 4: Simplify right side
   300,885x = 420,929,761,681
5. Step 5: Solve for x
   x = 420,929,761,681/300,885
6. Step 6: Final answer
   x = 1,398,972.24