Finding the Fourth Proportional to 111.70, 167.91 and 111.16

Step by Step Solution

1. Step 1: Write the proportion equation
   111.70 : 167.91 = 111.16 : x
2. Step 2: Convert to fraction form
   111.70/167.91 = 111.16/x
3. Step 3: Cross multiply
   111.70x = 167.91 × 111.16
4. Step 4: Simplify right side
   111.70x = 18,664.88
5. Step 5: Solve for x
   x = 18,664.88/111.70
6. Step 6: Final answer
   x = 167.10