Finding the Fourth Proportional to 111.42, 167.78 and 97.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 167.78 = 97.15 : x
2. Step 2: Convert to fraction form
   111.42/167.78 = 97.15/x
3. Step 3: Cross multiply
   111.42x = 167.78 × 97.15
4. Step 4: Simplify right side
   111.42x = 16,299.65
5. Step 5: Solve for x
   x = 16,299.65/111.42
6. Step 6: Final answer
   x = 146.29