Finding the Fourth Proportional to 115.76, 173.72 and 57.96

Step by Step Solution

1. Step 1: Write the proportion equation
   115.76 : 173.72 = 57.96 : x
2. Step 2: Convert to fraction form
   115.76/173.72 = 57.96/x
3. Step 3: Cross multiply
   115.76x = 173.72 × 57.96
4. Step 4: Simplify right side
   115.76x = 10,069.59
5. Step 5: Solve for x
   x = 10,069.59/115.76
6. Step 6: Final answer
   x = 86.99