Finding the Fourth Proportional to 8,131.24, 12,189.66 and 3,511.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,131.24 : 12,189.66 = 3,511.72 : x
2. Step 2: Convert to fraction form
   8,131.24/12,189.66 = 3,511.72/x
3. Step 3: Cross multiply
   8,131.24x = 12,189.66 × 3,511.72
4. Step 4: Simplify right side
   8,131.24x = 42,806,672.82
5. Step 5: Solve for x
   x = 42,806,672.82/8,131.24
6. Step 6: Final answer
   x = 5,264.47