Finding the Third Proportional to 2,078,978 and 4,478,788

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078,978 : 4,478,788 = 4,478,788 : x
2. Step 2: Convert to fraction form
   2,078,978/4,478,788 = 4,478,788/x
3. Step 3: Cross multiply
   2,078,978x = 4,478,788 × 4,478,788
4. Step 4: Simplify right side
   2,078,978x = 20,059,541,948,944
5. Step 5: Solve for x
   x = 20,059,541,948,944/2,078,978
6. Step 6: Final answer
   x = 9,648,751.43