Finding the Third Proportional to 639,850 and 1,400,228

Step by Step Solution

1. Step 1: Write the proportion equation
   639,850 : 1,400,228 = 1,400,228 : x
2. Step 2: Convert to fraction form
   639,850/1,400,228 = 1,400,228/x
3. Step 3: Cross multiply
   639,850x = 1,400,228 × 1,400,228
4. Step 4: Simplify right side
   639,850x = 1,960,638,451,984
5. Step 5: Solve for x
   x = 1,960,638,451,984/639,850
6. Step 6: Final answer
   x = 3,064,215.76