Finding the Third Proportional to 644,256 and 1,399,230

Step by Step Solution

1. Step 1: Write the proportion equation
   644,256 : 1,399,230 = 1,399,230 : x
2. Step 2: Convert to fraction form
   644,256/1,399,230 = 1,399,230/x
3. Step 3: Cross multiply
   644,256x = 1,399,230 × 1,399,230
4. Step 4: Simplify right side
   644,256x = 1,957,844,592,900
5. Step 5: Solve for x
   x = 1,957,844,592,900/644,256
6. Step 6: Final answer
   x = 3,038,923.34