Finding the Fourth Proportional to 13.56, 18.72 and 10.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13.56 : 18.72 = 10.49 : x
2. Step 2: Convert to fraction form
   13.56/18.72 = 10.49/x
3. Step 3: Cross multiply
   13.56x = 18.72 × 10.49
4. Step 4: Simplify right side
   13.56x = 196.37
5. Step 5: Solve for x
   x = 196.37/13.56
6. Step 6: Final answer
   x = 14.49