Finding the Fourth Proportional to 11.50, 15.79 and 10.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11.50 : 15.79 = 10.91 : x
2. Step 2: Convert to fraction form
   11.50/15.79 = 10.91/x
3. Step 3: Cross multiply
   11.50x = 15.79 × 10.91
4. Step 4: Simplify right side
   11.50x = 172.27
5. Step 5: Solve for x
   x = 172.27/11.50
6. Step 6: Final answer
   x = 14.98