Finding the Fourth Proportional to 12,086.12, 18,132.60 and 5,421.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.12 : 18,132.60 = 5,421.09 : x
2. Step 2: Convert to fraction form
   12,086.12/18,132.60 = 5,421.09/x
3. Step 3: Cross multiply
   12,086.12x = 18,132.60 × 5,421.09
4. Step 4: Simplify right side
   12,086.12x = 98,298,544.86
5. Step 5: Solve for x
   x = 98,298,544.86/12,086.12
6. Step 6: Final answer
   x = 8,133.17