Finding the Third Proportional to 639,414 and 1,400,652

Step by Step Solution

1. Step 1: Write the proportion equation
   639,414 : 1,400,652 = 1,400,652 : x
2. Step 2: Convert to fraction form
   639,414/1,400,652 = 1,400,652/x
3. Step 3: Cross multiply
   639,414x = 1,400,652 × 1,400,652
4. Step 4: Simplify right side
   639,414x = 1,961,826,025,104
5. Step 5: Solve for x
   x = 1,961,826,025,104/639,414
6. Step 6: Final answer
   x = 3,068,162.45