Finding the Fourth Proportional to 113.42, 170.17 and 59.28

Step by Step Solution

1. Step 1: Write the proportion equation
   113.42 : 170.17 = 59.28 : x
2. Step 2: Convert to fraction form
   113.42/170.17 = 59.28/x
3. Step 3: Cross multiply
   113.42x = 170.17 × 59.28
4. Step 4: Simplify right side
   113.42x = 10,086.89
5. Step 5: Solve for x
   x = 10,086.89/113.42
6. Step 6: Final answer
   x = 88.93