Finding the Fourth Proportional to 114.88, 172.34 and 42.72

Step by Step Solution

1. Step 1: Write the proportion equation
   114.88 : 172.34 = 42.72 : x
2. Step 2: Convert to fraction form
   114.88/172.34 = 42.72/x
3. Step 3: Cross multiply
   114.88x = 172.34 × 42.72
4. Step 4: Simplify right side
   114.88x = 7,362.36
5. Step 5: Solve for x
   x = 7,362.36/114.88
6. Step 6: Final answer
   x = 64.09