Finding the Fourth Proportional to 111.42, 153.43 and 102.71

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.43 = 102.71 : x
2. Step 2: Convert to fraction form
   111.42/153.43 = 102.71/x
3. Step 3: Cross multiply
   111.42x = 153.43 × 102.71
4. Step 4: Simplify right side
   111.42x = 15,758.92
5. Step 5: Solve for x
   x = 15,758.92/111.42
6. Step 6: Final answer
   x = 141.44