Finding the Fourth Proportional to 111.87, 167.76 and 71.37

Step by Step Solution

1. Step 1: Write the proportion equation
   111.87 : 167.76 = 71.37 : x
2. Step 2: Convert to fraction form
   111.87/167.76 = 71.37/x
3. Step 3: Cross multiply
   111.87x = 167.76 × 71.37
4. Step 4: Simplify right side
   111.87x = 11,973.03
5. Step 5: Solve for x
   x = 11,973.03/111.87
6. Step 6: Final answer
   x = 107.03