Finding the Fourth Proportional to 111.82, 167.60 and 71.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.82 : 167.60 = 71.15 : x
2. Step 2: Convert to fraction form
   111.82/167.60 = 71.15/x
3. Step 3: Cross multiply
   111.82x = 167.60 × 71.15
4. Step 4: Simplify right side
   111.82x = 11,924.74
5. Step 5: Solve for x
   x = 11,924.74/111.82
6. Step 6: Final answer
   x = 106.64