Finding the Fourth Proportional to 111.42, 167.40 and 105.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 167.40 = 105.62 : x
2. Step 2: Convert to fraction form
   111.42/167.40 = 105.62/x
3. Step 3: Cross multiply
   111.42x = 167.40 × 105.62
4. Step 4: Simplify right side
   111.42x = 17,679.95
5. Step 5: Solve for x
   x = 17,679.95/111.42
6. Step 6: Final answer
   x = 158.68