Finding the Fourth Proportional to 114.72, 172.08 and 111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   114.72 : 172.08 = 111.72 : x
2. Step 2: Convert to fraction form
   114.72/172.08 = 111.72/x
3. Step 3: Cross multiply
   114.72x = 172.08 × 111.72
4. Step 4: Simplify right side
   114.72x = 19,224.78
5. Step 5: Solve for x
   x = 19,224.78/114.72
6. Step 6: Final answer
   x = 167.58