Finding the Third Proportional to 3,978,057 and 8,589,981

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978,057 : 8,589,981 = 8,589,981 : x
2. Step 2: Convert to fraction form
   3,978,057/8,589,981 = 8,589,981/x
3. Step 3: Cross multiply
   3,978,057x = 8,589,981 × 8,589,981
4. Step 4: Simplify right side
   3,978,057x = 73,787,773,580,361
5. Step 5: Solve for x
   x = 73,787,773,580,361/3,978,057
6. Step 6: Final answer
   x = 18,548,696.91