Finding the Third Proportional to 639,900 and 1,400,330

Step by Step Solution

1. Step 1: Write the proportion equation
   639,900 : 1,400,330 = 1,400,330 : x
2. Step 2: Convert to fraction form
   639,900/1,400,330 = 1,400,330/x
3. Step 3: Cross multiply
   639,900x = 1,400,330 × 1,400,330
4. Step 4: Simplify right side
   639,900x = 1,960,924,108,900
5. Step 5: Solve for x
   x = 1,960,924,108,900/639,900
6. Step 6: Final answer
   x = 3,064,422.74