Finding the Fourth Proportional to 28.58, 42.81 and 24.80

Step by Step Solution

1. Step 1: Write the proportion equation
   28.58 : 42.81 = 24.80 : x
2. Step 2: Convert to fraction form
   28.58/42.81 = 24.80/x
3. Step 3: Cross multiply
   28.58x = 42.81 × 24.80
4. Step 4: Simplify right side
   28.58x = 1,061.69
5. Step 5: Solve for x
   x = 1,061.69/28.58
6. Step 6: Final answer
   x = 37.15