Finding the Fourth Proportional to 67.15, 100.71 and 21.48

Step by Step Solution

1. Step 1: Write the proportion equation
   67.15 : 100.71 = 21.48 : x
2. Step 2: Convert to fraction form
   67.15/100.71 = 21.48/x
3. Step 3: Cross multiply
   67.15x = 100.71 × 21.48
4. Step 4: Simplify right side
   67.15x = 2,162.87
5. Step 5: Solve for x
   x = 2,162.87/67.15
6. Step 6: Final answer
   x = 32.21