Finding the Third Proportional to 1,287,978 and 2,002,866

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287,978 : 2,002,866 = 2,002,866 : x
2. Step 2: Convert to fraction form
   1,287,978/2,002,866 = 2,002,866/x
3. Step 3: Cross multiply
   1,287,978x = 2,002,866 × 2,002,866
4. Step 4: Simplify right side
   1,287,978x = 4,011,472,213,956
5. Step 5: Solve for x
   x = 4,011,472,213,956/1,287,978
6. Step 6: Final answer
   x = 3,114,550.26