Finding the Fourth Proportional to 141.42, 212.33 and 111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   141.42 : 212.33 = 111.31 : x
2. Step 2: Convert to fraction form
   141.42/212.33 = 111.31/x
3. Step 3: Cross multiply
   141.42x = 212.33 × 111.31
4. Step 4: Simplify right side
   141.42x = 23,634.45
5. Step 5: Solve for x
   x = 23,634.45/141.42
6. Step 6: Final answer
   x = 167.12