Finding the Fourth Proportional to 111.88, 168.04 and 83.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111.88 : 168.04 = 83.12 : x
2. Step 2: Convert to fraction form
   111.88/168.04 = 83.12/x
3. Step 3: Cross multiply
   111.88x = 168.04 × 83.12
4. Step 4: Simplify right side
   111.88x = 13,967.48
5. Step 5: Solve for x
   x = 13,967.48/111.88
6. Step 6: Final answer
   x = 124.84