Finding the Fourth Proportional to 111.58, 167.50 and 81.32

Step by Step Solution

1. Step 1: Write the proportion equation
   111.58 : 167.50 = 81.32 : x
2. Step 2: Convert to fraction form
   111.58/167.50 = 81.32/x
3. Step 3: Cross multiply
   111.58x = 167.50 × 81.32
4. Step 4: Simplify right side
   111.58x = 13,621.10
5. Step 5: Solve for x
   x = 13,621.10/111.58
6. Step 6: Final answer
   x = 122.07