Finding the Fourth Proportional to 50.72, 69.98 and 28.88

Step by Step Solution

1. Step 1: Write the proportion equation
   50.72 : 69.98 = 28.88 : x
2. Step 2: Convert to fraction form
   50.72/69.98 = 28.88/x
3. Step 3: Cross multiply
   50.72x = 69.98 × 28.88
4. Step 4: Simplify right side
   50.72x = 2,020.53
5. Step 5: Solve for x
   x = 2,020.53/50.72
6. Step 6: Final answer
   x = 39.84