Finding the Fourth Proportional to 8,018.72, 11,067.84 and 6,419.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,018.72 : 11,067.84 = 6,419.12 : x
2. Step 2: Convert to fraction form
   8,018.72/11,067.84 = 6,419.12/x
3. Step 3: Cross multiply
   8,018.72x = 11,067.84 × 6,419.12
4. Step 4: Simplify right side
   8,018.72x = 71,045,793.10
5. Step 5: Solve for x
   x = 71,045,793.10/8,018.72
6. Step 6: Final answer
   x = 8,859.99