Finding the Fourth Proportional to 12,086.91, 18,131.21 and 5,059.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.91 : 18,131.21 = 5,059.85 : x
2. Step 2: Convert to fraction form
   12,086.91/18,131.21 = 5,059.85/x
3. Step 3: Cross multiply
   12,086.91x = 18,131.21 × 5,059.85
4. Step 4: Simplify right side
   12,086.91x = 91,741,086.96
5. Step 5: Solve for x
   x = 91,741,086.96/12,086.91
6. Step 6: Final answer
   x = 7,590.12