Finding the Third Proportional to 300,328 and 647,192

Step by Step Solution

1. Step 1: Write the proportion equation
   300,328 : 647,192 = 647,192 : x
2. Step 2: Convert to fraction form
   300,328/647,192 = 647,192/x
3. Step 3: Cross multiply
   300,328x = 647,192 × 647,192
4. Step 4: Simplify right side
   300,328x = 418,857,484,864
5. Step 5: Solve for x
   x = 418,857,484,864/300,328
6. Step 6: Final answer
   x = 1,394,666.78