Finding the Third Proportional to 3,978,061 and 8,589,989

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978,061 : 8,589,989 = 8,589,989 : x
2. Step 2: Convert to fraction form
   3,978,061/8,589,989 = 8,589,989/x
3. Step 3: Cross multiply
   3,978,061x = 8,589,989 × 8,589,989
4. Step 4: Simplify right side
   3,978,061x = 73,787,911,020,121
5. Step 5: Solve for x
   x = 73,787,911,020,121/3,978,061
6. Step 6: Final answer
   x = 18,548,712.81