Finding the Fourth Proportional to 67.21, 100.89 and 40.18

Step by Step Solution

1. Step 1: Write the proportion equation
   67.21 : 100.89 = 40.18 : x
2. Step 2: Convert to fraction form
   67.21/100.89 = 40.18/x
3. Step 3: Cross multiply
   67.21x = 100.89 × 40.18
4. Step 4: Simplify right side
   67.21x = 4,053.76
5. Step 5: Solve for x
   x = 4,053.76/67.21
6. Step 6: Final answer
   x = 60.31