Finding the Third Proportional to 639,821 and 1,400,170

Step by Step Solution

1. Step 1: Write the proportion equation
   639,821 : 1,400,170 = 1,400,170 : x
2. Step 2: Convert to fraction form
   639,821/1,400,170 = 1,400,170/x
3. Step 3: Cross multiply
   639,821x = 1,400,170 × 1,400,170
4. Step 4: Simplify right side
   639,821x = 1,960,476,028,900
5. Step 5: Solve for x
   x = 1,960,476,028,900/639,821
6. Step 6: Final answer
   x = 3,064,100.79