Finding the Fourth Proportional to 111.78, 167.72 and 97.35

Step by Step Solution

1. Step 1: Write the proportion equation
   111.78 : 167.72 = 97.35 : x
2. Step 2: Convert to fraction form
   111.78/167.72 = 97.35/x
3. Step 3: Cross multiply
   111.78x = 167.72 × 97.35
4. Step 4: Simplify right side
   111.78x = 16,327.54
5. Step 5: Solve for x
   x = 16,327.54/111.78
6. Step 6: Final answer
   x = 146.07