Finding the Fourth Proportional to 111.66, 167.30 and 72.63

Step by Step Solution

1. Step 1: Write the proportion equation
   111.66 : 167.30 = 72.63 : x
2. Step 2: Convert to fraction form
   111.66/167.30 = 72.63/x
3. Step 3: Cross multiply
   111.66x = 167.30 × 72.63
4. Step 4: Simplify right side
   111.66x = 12,150.91
5. Step 5: Solve for x
   x = 12,150.91/111.66
6. Step 6: Final answer
   x = 108.82