Finding the Third Proportional to 644,336 and 1,394,864

Step by Step Solution

1. Step 1: Write the proportion equation
   644,336 : 1,394,864 = 1,394,864 : x
2. Step 2: Convert to fraction form
   644,336/1,394,864 = 1,394,864/x
3. Step 3: Cross multiply
   644,336x = 1,394,864 × 1,394,864
4. Step 4: Simplify right side
   644,336x = 1,945,645,578,496
5. Step 5: Solve for x
   x = 1,945,645,578,496/644,336
6. Step 6: Final answer
   x = 3,019,613.34