Finding the Third Proportional to 639,912 and 1,400,352

Step by Step Solution

1. Step 1: Write the proportion equation
   639,912 : 1,400,352 = 1,400,352 : x
2. Step 2: Convert to fraction form
   639,912/1,400,352 = 1,400,352/x
3. Step 3: Cross multiply
   639,912x = 1,400,352 × 1,400,352
4. Step 4: Simplify right side
   639,912x = 1,960,985,723,904
5. Step 5: Solve for x
   x = 1,960,985,723,904/639,912
6. Step 6: Final answer
   x = 3,064,461.56