Finding the Fourth Proportional to 111.84, 167.89 and 71.43

Step by Step Solution

1. Step 1: Write the proportion equation
   111.84 : 167.89 = 71.43 : x
2. Step 2: Convert to fraction form
   111.84/167.89 = 71.43/x
3. Step 3: Cross multiply
   111.84x = 167.89 × 71.43
4. Step 4: Simplify right side
   111.84x = 11,992.38
5. Step 5: Solve for x
   x = 11,992.38/111.84
6. Step 6: Final answer
   x = 107.23