Finding the Third Proportional to 639,877 and 1,400,282

Step by Step Solution

1. Step 1: Write the proportion equation
   639,877 : 1,400,282 = 1,400,282 : x
2. Step 2: Convert to fraction form
   639,877/1,400,282 = 1,400,282/x
3. Step 3: Cross multiply
   639,877x = 1,400,282 × 1,400,282
4. Step 4: Simplify right side
   639,877x = 1,960,789,679,524
5. Step 5: Solve for x
   x = 1,960,789,679,524/639,877
6. Step 6: Final answer
   x = 3,064,322.80