Finding the Fourth Proportional to 42.16, 62.96 and 40.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42.16 : 62.96 = 40.72 : x
2. Step 2: Convert to fraction form
   42.16/62.96 = 40.72/x
3. Step 3: Cross multiply
   42.16x = 62.96 × 40.72
4. Step 4: Simplify right side
   42.16x = 2,563.73
5. Step 5: Solve for x
   x = 2,563.73/42.16
6. Step 6: Final answer
   x = 60.81