Finding the Fourth Proportional to 67.22, 100.79 and 40.15

Step by Step Solution

1. Step 1: Write the proportion equation
   67.22 : 100.79 = 40.15 : x
2. Step 2: Convert to fraction form
   67.22/100.79 = 40.15/x
3. Step 3: Cross multiply
   67.22x = 100.79 × 40.15
4. Step 4: Simplify right side
   67.22x = 4,046.72
5. Step 5: Solve for x
   x = 4,046.72/67.22
6. Step 6: Final answer
   x = 60.20