Finding the Third Proportional to 644,400 and 1,399,560

Step by Step Solution

1. Step 1: Write the proportion equation
   644,400 : 1,399,560 = 1,399,560 : x
2. Step 2: Convert to fraction form
   644,400/1,399,560 = 1,399,560/x
3. Step 3: Cross multiply
   644,400x = 1,399,560 × 1,399,560
4. Step 4: Simplify right side
   644,400x = 1,958,768,193,600
5. Step 5: Solve for x
   x = 1,958,768,193,600/644,400
6. Step 6: Final answer
   x = 3,039,677.52