Finding the Third Proportional to 640,858 and 1,383,042

Step by Step Solution

1. Step 1: Write the proportion equation
   640,858 : 1,383,042 = 1,383,042 : x
2. Step 2: Convert to fraction form
   640,858/1,383,042 = 1,383,042/x
3. Step 3: Cross multiply
   640,858x = 1,383,042 × 1,383,042
4. Step 4: Simplify right side
   640,858x = 1,912,805,173,764
5. Step 5: Solve for x
   x = 1,912,805,173,764/640,858
6. Step 6: Final answer
   x = 2,984,756.64