Finding the Fourth Proportional to 11.42, 15.78 and 10.67

Step by Step Solution

1. Step 1: Write the proportion equation
   11.42 : 15.78 = 10.67 : x
2. Step 2: Convert to fraction form
   11.42/15.78 = 10.67/x
3. Step 3: Cross multiply
   11.42x = 15.78 × 10.67
4. Step 4: Simplify right side
   11.42x = 168.37
5. Step 5: Solve for x
   x = 168.37/11.42
6. Step 6: Final answer
   x = 14.74