Finding the Fourth Proportional to 111.98, 168.13 and 57.92

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 168.13 = 57.92 : x
2. Step 2: Convert to fraction form
   111.98/168.13 = 57.92/x
3. Step 3: Cross multiply
   111.98x = 168.13 × 57.92
4. Step 4: Simplify right side
   111.98x = 9,738.09
5. Step 5: Solve for x
   x = 9,738.09/111.98
6. Step 6: Final answer
   x = 86.96