Finding the Fourth Proportional to 67.24, 100.79 and 31.15

Step by Step Solution

1. Step 1: Write the proportion equation
   67.24 : 100.79 = 31.15 : x
2. Step 2: Convert to fraction form
   67.24/100.79 = 31.15/x
3. Step 3: Cross multiply
   67.24x = 100.79 × 31.15
4. Step 4: Simplify right side
   67.24x = 3,139.45
5. Step 5: Solve for x
   x = 3,139.45/67.24
6. Step 6: Final answer
   x = 46.69