Finding the Fourth Proportional to 42.56, 58.72 and 30.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42.56 : 58.72 = 30.28 : x
2. Step 2: Convert to fraction form
   42.56/58.72 = 30.28/x
3. Step 3: Cross multiply
   42.56x = 58.72 × 30.28
4. Step 4: Simplify right side
   42.56x = 1,778.04
5. Step 5: Solve for x
   x = 1,778.04/42.56
6. Step 6: Final answer
   x = 41.78