Finding the Fourth Proportional to 111.87, 167.72 and 104.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.87 : 167.72 = 104.31 : x
2. Step 2: Convert to fraction form
   111.87/167.72 = 104.31/x
3. Step 3: Cross multiply
   111.87x = 167.72 × 104.31
4. Step 4: Simplify right side
   111.87x = 17,494.35
5. Step 5: Solve for x
   x = 17,494.35/111.87
6. Step 6: Final answer
   x = 156.38