Finding the Fourth Proportional to 111.90, 168.16 and 60.58

Step by Step Solution

1. Step 1: Write the proportion equation
   111.90 : 168.16 = 60.58 : x
2. Step 2: Convert to fraction form
   111.90/168.16 = 60.58/x
3. Step 3: Cross multiply
   111.90x = 168.16 × 60.58
4. Step 4: Simplify right side
   111.90x = 10,186.83
5. Step 5: Solve for x
   x = 10,186.83/111.90
6. Step 6: Final answer
   x = 91.04