Finding the Third Proportional to 639,842 and 1,372,780

Step by Step Solution

1. Step 1: Write the proportion equation
   639,842 : 1,372,780 = 1,372,780 : x
2. Step 2: Convert to fraction form
   639,842/1,372,780 = 1,372,780/x
3. Step 3: Cross multiply
   639,842x = 1,372,780 × 1,372,780
4. Step 4: Simplify right side
   639,842x = 1,884,524,928,400
5. Step 5: Solve for x
   x = 1,884,524,928,400/639,842
6. Step 6: Final answer
   x = 2,945,297.32