Finding the Third Proportional to 644,406 and 1,399,572

Step by Step Solution

1. Step 1: Write the proportion equation
   644,406 : 1,399,572 = 1,399,572 : x
2. Step 2: Convert to fraction form
   644,406/1,399,572 = 1,399,572/x
3. Step 3: Cross multiply
   644,406x = 1,399,572 × 1,399,572
4. Step 4: Simplify right side
   644,406x = 1,958,801,783,184
5. Step 5: Solve for x
   x = 1,958,801,783,184/644,406
6. Step 6: Final answer
   x = 3,039,701.34