Finding the Third Proportional to 639,860 and 1,400,248

Step by Step Solution

1. Step 1: Write the proportion equation
   639,860 : 1,400,248 = 1,400,248 : x
2. Step 2: Convert to fraction form
   639,860/1,400,248 = 1,400,248/x
3. Step 3: Cross multiply
   639,860x = 1,400,248 × 1,400,248
4. Step 4: Simplify right side
   639,860x = 1,960,694,461,504
5. Step 5: Solve for x
   x = 1,960,694,461,504/639,860
6. Step 6: Final answer
   x = 3,064,255.40