Finding the Fourth Proportional to 12,015.54, 18,018.72 and 5,771.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,015.54 : 18,018.72 = 5,771.64 : x
2. Step 2: Convert to fraction form
   12,015.54/18,018.72 = 5,771.64/x
3. Step 3: Cross multiply
   12,015.54x = 18,018.72 × 5,771.64
4. Step 4: Simplify right side
   12,015.54x = 103,997,565.10
5. Step 5: Solve for x
   x = 103,997,565.10/12,015.54
6. Step 6: Final answer
   x = 8,655.26