Finding the Third Proportional to 644,632 and 1,396,400

Step by Step Solution

1. Step 1: Write the proportion equation
   644,632 : 1,396,400 = 1,396,400 : x
2. Step 2: Convert to fraction form
   644,632/1,396,400 = 1,396,400/x
3. Step 3: Cross multiply
   644,632x = 1,396,400 × 1,396,400
4. Step 4: Simplify right side
   644,632x = 1,949,932,960,000
5. Step 5: Solve for x
   x = 1,949,932,960,000/644,632
6. Step 6: Final answer
   x = 3,024,877.70