Finding the Fourth Proportional to 12,086.41, 18,129.16 and 3,321.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.41 : 18,129.16 = 3,321.10 : x
2. Step 2: Convert to fraction form
   12,086.41/18,129.16 = 3,321.10/x
3. Step 3: Cross multiply
   12,086.41x = 18,129.16 × 3,321.10
4. Step 4: Simplify right side
   12,086.41x = 60,208,654.33
5. Step 5: Solve for x
   x = 60,208,654.33/12,086.41
6. Step 6: Final answer
   x = 4,981.52