Finding the Third Proportional to 644,294 and 1,399,306

Step by Step Solution

1. Step 1: Write the proportion equation
   644,294 : 1,399,306 = 1,399,306 : x
2. Step 2: Convert to fraction form
   644,294/1,399,306 = 1,399,306/x
3. Step 3: Cross multiply
   644,294x = 1,399,306 × 1,399,306
4. Step 4: Simplify right side
   644,294x = 1,958,057,281,636
5. Step 5: Solve for x
   x = 1,958,057,281,636/644,294
6. Step 6: Final answer
   x = 3,039,074.21