Finding the Fourth Proportional to 11.31, 16.94 and 10.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11.31 : 16.94 = 10.56 : x
2. Step 2: Convert to fraction form
   11.31/16.94 = 10.56/x
3. Step 3: Cross multiply
   11.31x = 16.94 × 10.56
4. Step 4: Simplify right side
   11.31x = 178.83
5. Step 5: Solve for x
   x = 178.83/11.31
6. Step 6: Final answer
   x = 15.81