Finding the Fourth Proportional to 111.71, 154.09 and 67.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.71 : 154.09 = 67.42 : x
2. Step 2: Convert to fraction form
   111.71/154.09 = 67.42/x
3. Step 3: Cross multiply
   111.71x = 154.09 × 67.42
4. Step 4: Simplify right side
   111.71x = 10,387.64
5. Step 5: Solve for x
   x = 10,387.64/111.71
6. Step 6: Final answer
   x = 92.99