Finding the Fourth Proportional to 42.88, 59.15 and 25.39

Step by Step Solution

1. Step 1: Write the proportion equation
   42.88 : 59.15 = 25.39 : x
2. Step 2: Convert to fraction form
   42.88/59.15 = 25.39/x
3. Step 3: Cross multiply
   42.88x = 59.15 × 25.39
4. Step 4: Simplify right side
   42.88x = 1,501.52
5. Step 5: Solve for x
   x = 1,501.52/42.88
6. Step 6: Final answer
   x = 35.02