Finding the Third Proportional to 1,065,978 and 1,408,455

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065,978 : 1,408,455 = 1,408,455 : x
2. Step 2: Convert to fraction form
   1,065,978/1,408,455 = 1,408,455/x
3. Step 3: Cross multiply
   1,065,978x = 1,408,455 × 1,408,455
4. Step 4: Simplify right side
   1,065,978x = 1,983,745,487,025
5. Step 5: Solve for x
   x = 1,983,745,487,025/1,065,978
6. Step 6: Final answer
   x = 1,860,962.88