Finding the Fourth Proportional to 28.37, 42.50 and 18.19

Step by Step Solution

1. Step 1: Write the proportion equation
   28.37 : 42.50 = 18.19 : x
2. Step 2: Convert to fraction form
   28.37/42.50 = 18.19/x
3. Step 3: Cross multiply
   28.37x = 42.50 × 18.19
4. Step 4: Simplify right side
   28.37x = 772.91
5. Step 5: Solve for x
   x = 772.91/28.37
6. Step 6: Final answer
   x = 27.25