Finding the Fourth Proportional to 111.99, 168.09 and 60.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.99 : 168.09 = 60.69 : x
2. Step 2: Convert to fraction form
   111.99/168.09 = 60.69/x
3. Step 3: Cross multiply
   111.99x = 168.09 × 60.69
4. Step 4: Simplify right side
   111.99x = 10,201.38
5. Step 5: Solve for x
   x = 10,201.38/111.99
6. Step 6: Final answer
   x = 91.09