Finding the Fourth Proportional to 11.39, 15.71 and 10.22

Step by Step Solution

1. Step 1: Write the proportion equation
   11.39 : 15.71 = 10.22 : x
2. Step 2: Convert to fraction form
   11.39/15.71 = 10.22/x
3. Step 3: Cross multiply
   11.39x = 15.71 × 10.22
4. Step 4: Simplify right side
   11.39x = 160.43
5. Step 5: Solve for x
   x = 160.43/11.39
6. Step 6: Final answer
   x = 14.09