Finding the Fourth Proportional to 8,616.05, 11,888.72 and 5,078.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,616.05 : 11,888.72 = 5,078.78 : x
2. Step 2: Convert to fraction form
   8,616.05/11,888.72 = 5,078.78/x
3. Step 3: Cross multiply
   8,616.05x = 11,888.72 × 5,078.78
4. Step 4: Simplify right side
   8,616.05x = 60,380,138.25
5. Step 5: Solve for x
   x = 60,380,138.25/8,616.05
6. Step 6: Final answer
   x = 7,007.87