Finding the Fourth Proportional to 8,111.41, 12,143.54 and 7,267.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.41 : 12,143.54 = 7,267.28 : x
2. Step 2: Convert to fraction form
   8,111.41/12,143.54 = 7,267.28/x
3. Step 3: Cross multiply
   8,111.41x = 12,143.54 × 7,267.28
4. Step 4: Simplify right side
   8,111.41x = 88,250,462.82
5. Step 5: Solve for x
   x = 88,250,462.82/8,111.41
6. Step 6: Final answer
   x = 10,879.80