Finding the Fourth Proportional to 11.22, 16.82 and 3.99

Step by Step Solution

1. Step 1: Write the proportion equation
   11.22 : 16.82 = 3.99 : x
2. Step 2: Convert to fraction form
   11.22/16.82 = 3.99/x
3. Step 3: Cross multiply
   11.22x = 16.82 × 3.99
4. Step 4: Simplify right side
   11.22x = 67.15
5. Step 5: Solve for x
   x = 67.15/11.22
6. Step 6: Final answer
   x = 5.99