Finding the Fourth Proportional to 80.71, 111.39 and 51.59

Step by Step Solution

1. Step 1: Write the proportion equation
   80.71 : 111.39 = 51.59 : x
2. Step 2: Convert to fraction form
   80.71/111.39 = 51.59/x
3. Step 3: Cross multiply
   80.71x = 111.39 × 51.59
4. Step 4: Simplify right side
   80.71x = 5,746.61
5. Step 5: Solve for x
   x = 5,746.61/80.71
6. Step 6: Final answer
   x = 71.20