Finding the Third Proportional to 639,908 and 1,400,328

Step by Step Solution

1. Step 1: Write the proportion equation
   639,908 : 1,400,328 = 1,400,328 : x
2. Step 2: Convert to fraction form
   639,908/1,400,328 = 1,400,328/x
3. Step 3: Cross multiply
   639,908x = 1,400,328 × 1,400,328
4. Step 4: Simplify right side
   639,908x = 1,960,918,507,584
5. Step 5: Solve for x
   x = 1,960,918,507,584/639,908
6. Step 6: Final answer
   x = 3,064,375.67