Finding the Third Proportional to 639,256 and 1,365,992

Step by Step Solution

1. Step 1: Write the proportion equation
   639,256 : 1,365,992 = 1,365,992 : x
2. Step 2: Convert to fraction form
   639,256/1,365,992 = 1,365,992/x
3. Step 3: Cross multiply
   639,256x = 1,365,992 × 1,365,992
4. Step 4: Simplify right side
   639,256x = 1,865,934,144,064
5. Step 5: Solve for x
   x = 1,865,934,144,064/639,256
6. Step 6: Final answer
   x = 2,918,915.34