Finding the Third Proportional to 639,606 and 1,407,996

Step by Step Solution

1. Step 1: Write the proportion equation
   639,606 : 1,407,996 = 1,407,996 : x
2. Step 2: Convert to fraction form
   639,606/1,407,996 = 1,407,996/x
3. Step 3: Cross multiply
   639,606x = 1,407,996 × 1,407,996
4. Step 4: Simplify right side
   639,606x = 1,982,452,736,016
5. Step 5: Solve for x
   x = 1,982,452,736,016/639,606
6. Step 6: Final answer
   x = 3,099,490.52