Finding the Fourth Proportional to 59.91, 89.99 and 56.76

Step by Step Solution

1. Step 1: Write the proportion equation
   59.91 : 89.99 = 56.76 : x
2. Step 2: Convert to fraction form
   59.91/89.99 = 56.76/x
3. Step 3: Cross multiply
   59.91x = 89.99 × 56.76
4. Step 4: Simplify right side
   59.91x = 5,107.55
5. Step 5: Solve for x
   x = 5,107.55/59.91
6. Step 6: Final answer
   x = 85.25