Finding the Fourth Proportional to 59.11, 81.64 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   59.11 : 81.64 = 42.71 : x
2. Step 2: Convert to fraction form
   59.11/81.64 = 42.71/x
3. Step 3: Cross multiply
   59.11x = 81.64 × 42.71
4. Step 4: Simplify right side
   59.11x = 3,486.49
5. Step 5: Solve for x
   x = 3,486.49/59.11
6. Step 6: Final answer
   x = 58.99