Finding the Fourth Proportional to 111.92, 167.88 and 100.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.92 : 167.88 = 100.31 : x
2. Step 2: Convert to fraction form
   111.92/167.88 = 100.31/x
3. Step 3: Cross multiply
   111.92x = 167.88 × 100.31
4. Step 4: Simplify right side
   111.92x = 16,840.04
5. Step 5: Solve for x
   x = 16,840.04/111.92
6. Step 6: Final answer
   x = 150.47