Finding the Fourth Proportional to 111.05, 153.24 and 64.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.05 : 153.24 = 64.42 : x
2. Step 2: Convert to fraction form
   111.05/153.24 = 64.42/x
3. Step 3: Cross multiply
   111.05x = 153.24 × 64.42
4. Step 4: Simplify right side
   111.05x = 9,871.72
5. Step 5: Solve for x
   x = 9,871.72/111.05
6. Step 6: Final answer
   x = 88.89