Finding the Fourth Proportional to 11.89, 17.98 and 11.82

Step by Step Solution

1. Step 1: Write the proportion equation
   11.89 : 17.98 = 11.82 : x
2. Step 2: Convert to fraction form
   11.89/17.98 = 11.82/x
3. Step 3: Cross multiply
   11.89x = 17.98 × 11.82
4. Step 4: Simplify right side
   11.89x = 212.52
5. Step 5: Solve for x
   x = 212.52/11.89
6. Step 6: Final answer
   x = 17.87