Finding the Fourth Proportional to 42.88, 59.24 and 39.05

Step by Step Solution

1. Step 1: Write the proportion equation
   42.88 : 59.24 = 39.05 : x
2. Step 2: Convert to fraction form
   42.88/59.24 = 39.05/x
3. Step 3: Cross multiply
   42.88x = 59.24 × 39.05
4. Step 4: Simplify right side
   42.88x = 2,313.27
5. Step 5: Solve for x
   x = 2,313.27/42.88
6. Step 6: Final answer
   x = 53.95