Finding the Third Proportional to 644,260 and 1,399,238

Step by Step Solution

1. Step 1: Write the proportion equation
   644,260 : 1,399,238 = 1,399,238 : x
2. Step 2: Convert to fraction form
   644,260/1,399,238 = 1,399,238/x
3. Step 3: Cross multiply
   644,260x = 1,399,238 × 1,399,238
4. Step 4: Simplify right side
   644,260x = 1,957,866,980,644
5. Step 5: Solve for x
   x = 1,957,866,980,644/644,260
6. Step 6: Final answer
   x = 3,038,939.22