Finding the Third Proportional to 2,121,816 and 4,341,678

Step by Step Solution

1. Step 1: Write the proportion equation
   2,121,816 : 4,341,678 = 4,341,678 : x
2. Step 2: Convert to fraction form
   2,121,816/4,341,678 = 4,341,678/x
3. Step 3: Cross multiply
   2,121,816x = 4,341,678 × 4,341,678
4. Step 4: Simplify right side
   2,121,816x = 18,850,167,855,684
5. Step 5: Solve for x
   x = 18,850,167,855,684/2,121,816
6. Step 6: Final answer
   x = 8,883,978.56