Finding the Fourth Proportional to 11.15, 16.72 and 3.93

Step by Step Solution

1. Step 1: Write the proportion equation
   11.15 : 16.72 = 3.93 : x
2. Step 2: Convert to fraction form
   11.15/16.72 = 3.93/x
3. Step 3: Cross multiply
   11.15x = 16.72 × 3.93
4. Step 4: Simplify right side
   11.15x = 65.71
5. Step 5: Solve for x
   x = 65.71/11.15
6. Step 6: Final answer
   x = 5.89