Finding the Fourth Proportional to 111.57, 167.60 and 73.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111.57 : 167.60 = 73.12 : x
2. Step 2: Convert to fraction form
   111.57/167.60 = 73.12/x
3. Step 3: Cross multiply
   111.57x = 167.60 × 73.12
4. Step 4: Simplify right side
   111.57x = 12,254.91
5. Step 5: Solve for x
   x = 12,254.91/111.57
6. Step 6: Final answer
   x = 109.84