Finding the Third Proportional to 639,443 and 1,399,240

Step by Step Solution

1. Step 1: Write the proportion equation
   639,443 : 1,399,240 = 1,399,240 : x
2. Step 2: Convert to fraction form
   639,443/1,399,240 = 1,399,240/x
3. Step 3: Cross multiply
   639,443x = 1,399,240 × 1,399,240
4. Step 4: Simplify right side
   639,443x = 1,957,872,577,600
5. Step 5: Solve for x
   x = 1,957,872,577,600/639,443
6. Step 6: Final answer
   x = 3,061,840.66