Finding the Third Proportional to 639,768 and 1,358,256

Step by Step Solution

1. Step 1: Write the proportion equation
   639,768 : 1,358,256 = 1,358,256 : x
2. Step 2: Convert to fraction form
   639,768/1,358,256 = 1,358,256/x
3. Step 3: Cross multiply
   639,768x = 1,358,256 × 1,358,256
4. Step 4: Simplify right side
   639,768x = 1,844,859,361,536
5. Step 5: Solve for x
   x = 1,844,859,361,536/639,768
6. Step 6: Final answer
   x = 2,883,638.07