Finding the Third Proportional to 621,142 and 1,268,408

Step by Step Solution

1. Step 1: Write the proportion equation
   621,142 : 1,268,408 = 1,268,408 : x
2. Step 2: Convert to fraction form
   621,142/1,268,408 = 1,268,408/x
3. Step 3: Cross multiply
   621,142x = 1,268,408 × 1,268,408
4. Step 4: Simplify right side
   621,142x = 1,608,858,854,464
5. Step 5: Solve for x
   x = 1,608,858,854,464/621,142
6. Step 6: Final answer
   x = 2,590,162.72