Finding the Fourth Proportional to 111.78, 167.34 and 73.17

Step by Step Solution

1. Step 1: Write the proportion equation
   111.78 : 167.34 = 73.17 : x
2. Step 2: Convert to fraction form
   111.78/167.34 = 73.17/x
3. Step 3: Cross multiply
   111.78x = 167.34 × 73.17
4. Step 4: Simplify right side
   111.78x = 12,244.27
5. Step 5: Solve for x
   x = 12,244.27/111.78
6. Step 6: Final answer
   x = 109.54