Finding the Fourth Proportional to 115.89, 173.89 and 75.30

Step by Step Solution

1. Step 1: Write the proportion equation
   115.89 : 173.89 = 75.30 : x
2. Step 2: Convert to fraction form
   115.89/173.89 = 75.30/x
3. Step 3: Cross multiply
   115.89x = 173.89 × 75.30
4. Step 4: Simplify right side
   115.89x = 13,093.92
5. Step 5: Solve for x
   x = 13,093.92/115.89
6. Step 6: Final answer
   x = 112.99