Finding the Fourth Proportional to 42.88, 59.23 and 38.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42.88 : 59.23 = 38.79 : x
2. Step 2: Convert to fraction form
   42.88/59.23 = 38.79/x
3. Step 3: Cross multiply
   42.88x = 59.23 × 38.79
4. Step 4: Simplify right side
   42.88x = 2,297.53
5. Step 5: Solve for x
   x = 2,297.53/42.88
6. Step 6: Final answer
   x = 53.58