Finding the Fourth Proportional to 42.88, 59.16 and 42.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42.88 : 59.16 = 42.72 : x
2. Step 2: Convert to fraction form
   42.88/59.16 = 42.72/x
3. Step 3: Cross multiply
   42.88x = 59.16 × 42.72
4. Step 4: Simplify right side
   42.88x = 2,527.32
5. Step 5: Solve for x
   x = 2,527.32/42.88
6. Step 6: Final answer
   x = 58.94