Finding the Fourth Proportional to 59.19, 81.71 and 42.80

Step by Step Solution

1. Step 1: Write the proportion equation
   59.19 : 81.71 = 42.80 : x
2. Step 2: Convert to fraction form
   59.19/81.71 = 42.80/x
3. Step 3: Cross multiply
   59.19x = 81.71 × 42.80
4. Step 4: Simplify right side
   59.19x = 3,496.57
5. Step 5: Solve for x
   x = 3,496.57/59.19
6. Step 6: Final answer
   x = 59.07