Finding the Third Proportional to 639,858 and 1,400,244

Step by Step Solution

1. Step 1: Write the proportion equation
   639,858 : 1,400,244 = 1,400,244 : x
2. Step 2: Convert to fraction form
   639,858/1,400,244 = 1,400,244/x
3. Step 3: Cross multiply
   639,858x = 1,400,244 × 1,400,244
4. Step 4: Simplify right side
   639,858x = 1,960,683,259,536
5. Step 5: Solve for x
   x = 1,960,683,259,536/639,858
6. Step 6: Final answer
   x = 3,064,247.47