Finding the Fourth Proportional to 13,150.92, 18,129.42 and 8,111.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.92 : 18,129.42 = 8,111.76 : x
2. Step 2: Convert to fraction form
   13,150.92/18,129.42 = 8,111.76/x
3. Step 3: Cross multiply
   13,150.92x = 18,129.42 × 8,111.76
4. Step 4: Simplify right side
   13,150.92x = 147,061,503.98
5. Step 5: Solve for x
   x = 147,061,503.98/13,150.92
6. Step 6: Final answer
   x = 11,182.60