Finding the Third Proportional to 639,444 and 1,399,242

Step by Step Solution

1. Step 1: Write the proportion equation
   639,444 : 1,399,242 = 1,399,242 : x
2. Step 2: Convert to fraction form
   639,444/1,399,242 = 1,399,242/x
3. Step 3: Cross multiply
   639,444x = 1,399,242 × 1,399,242
4. Step 4: Simplify right side
   639,444x = 1,957,878,174,564
5. Step 5: Solve for x
   x = 1,957,878,174,564/639,444
6. Step 6: Final answer
   x = 3,061,844.63