Finding the Third Proportional to 300,900 and 648,816

Step by Step Solution

1. Step 1: Write the proportion equation
   300,900 : 648,816 = 648,816 : x
2. Step 2: Convert to fraction form
   300,900/648,816 = 648,816/x
3. Step 3: Cross multiply
   300,900x = 648,816 × 648,816
4. Step 4: Simplify right side
   300,900x = 420,962,201,856
5. Step 5: Solve for x
   x = 420,962,201,856/300,900
6. Step 6: Final answer
   x = 1,399,010.31