Finding the Fourth Proportional to 74.18, 111.18 and 28.50

Step by Step Solution

1. Step 1: Write the proportion equation
   74.18 : 111.18 = 28.50 : x
2. Step 2: Convert to fraction form
   74.18/111.18 = 28.50/x
3. Step 3: Cross multiply
   74.18x = 111.18 × 28.50
4. Step 4: Simplify right side
   74.18x = 3,169.15
5. Step 5: Solve for x
   x = 3,169.15/74.18
6. Step 6: Final answer
   x = 42.73