Finding the Fourth Proportional to 42.50, 58.89 and 42.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42.50 : 58.89 = 42.28 : x
2. Step 2: Convert to fraction form
   42.50/58.89 = 42.28/x
3. Step 3: Cross multiply
   42.50x = 58.89 × 42.28
4. Step 4: Simplify right side
   42.50x = 2,489.87
5. Step 5: Solve for x
   x = 2,489.87/42.50
6. Step 6: Final answer
   x = 58.59