Finding the Fourth Proportional to 28.41, 42.59 and 18.79

Step by Step Solution

1. Step 1: Write the proportion equation
   28.41 : 42.59 = 18.79 : x
2. Step 2: Convert to fraction form
   28.41/42.59 = 18.79/x
3. Step 3: Cross multiply
   28.41x = 42.59 × 18.79
4. Step 4: Simplify right side
   28.41x = 800.27
5. Step 5: Solve for x
   x = 800.27/28.41
6. Step 6: Final answer
   x = 28.17