Finding the Fourth Proportional to 111.63, 167.31 and 79.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111.63 : 167.31 = 79.50 : x
2. Step 2: Convert to fraction form
   111.63/167.31 = 79.50/x
3. Step 3: Cross multiply
   111.63x = 167.31 × 79.50
4. Step 4: Simplify right side
   111.63x = 13,301.15
5. Step 5: Solve for x
   x = 13,301.15/111.63
6. Step 6: Final answer
   x = 119.15