Finding the Fourth Proportional to 111.99, 168.00 and 57.86

Step by Step Solution

1. Step 1: Write the proportion equation
   111.99 : 168.00 = 57.86 : x
2. Step 2: Convert to fraction form
   111.99/168.00 = 57.86/x
3. Step 3: Cross multiply
   111.99x = 168.00 × 57.86
4. Step 4: Simplify right side
   111.99x = 9,720.19
5. Step 5: Solve for x
   x = 9,720.19/111.99
6. Step 6: Final answer
   x = 86.80