Finding the Fourth Proportional to 33.98, 50.91 and 28.55

Step by Step Solution

1. Step 1: Write the proportion equation
   33.98 : 50.91 = 28.55 : x
2. Step 2: Convert to fraction form
   33.98/50.91 = 28.55/x
3. Step 3: Cross multiply
   33.98x = 50.91 × 28.55
4. Step 4: Simplify right side
   33.98x = 1,453.61
5. Step 5: Solve for x
   x = 1,453.61/33.98
6. Step 6: Final answer
   x = 42.78