Finding the Third Proportional to 300,648 and 647,808

Step by Step Solution

1. Step 1: Write the proportion equation
   300,648 : 647,808 = 647,808 : x
2. Step 2: Convert to fraction form
   300,648/647,808 = 647,808/x
3. Step 3: Cross multiply
   300,648x = 647,808 × 647,808
4. Step 4: Simplify right side
   300,648x = 419,655,204,864
5. Step 5: Solve for x
   x = 419,655,204,864/300,648
6. Step 6: Final answer
   x = 1,395,835.68