Finding the Fourth Proportional to 59.39, 81.91 and 56.28

Step by Step Solution

1. Step 1: Write the proportion equation
   59.39 : 81.91 = 56.28 : x
2. Step 2: Convert to fraction form
   59.39/81.91 = 56.28/x
3. Step 3: Cross multiply
   59.39x = 81.91 × 56.28
4. Step 4: Simplify right side
   59.39x = 4,609.89
5. Step 5: Solve for x
   x = 4,609.89/59.39
6. Step 6: Final answer
   x = 77.62