Finding the Third Proportional to 2,220,590 and 4,777,978

Step by Step Solution

1. Step 1: Write the proportion equation
   2,220,590 : 4,777,978 = 4,777,978 : x
2. Step 2: Convert to fraction form
   2,220,590/4,777,978 = 4,777,978/x
3. Step 3: Cross multiply
   2,220,590x = 4,777,978 × 4,777,978
4. Step 4: Simplify right side
   2,220,590x = 22,829,073,768,484
5. Step 5: Solve for x
   x = 22,829,073,768,484/2,220,590
6. Step 6: Final answer
   x = 10,280,634.32