Finding the Third Proportional to 644,340 and 1,394,874

Step by Step Solution

1. Step 1: Write the proportion equation
   644,340 : 1,394,874 = 1,394,874 : x
2. Step 2: Convert to fraction form
   644,340/1,394,874 = 1,394,874/x
3. Step 3: Cross multiply
   644,340x = 1,394,874 × 1,394,874
4. Step 4: Simplify right side
   644,340x = 1,945,673,475,876
5. Step 5: Solve for x
   x = 1,945,673,475,876/644,340
6. Step 6: Final answer
   x = 3,019,637.89