Finding the Fourth Proportional to 111.96, 168.06 and 83.06

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 168.06 = 83.06 : x
2. Step 2: Convert to fraction form
   111.96/168.06 = 83.06/x
3. Step 3: Cross multiply
   111.96x = 168.06 × 83.06
4. Step 4: Simplify right side
   111.96x = 13,959.06
5. Step 5: Solve for x
   x = 13,959.06/111.96
6. Step 6: Final answer
   x = 124.68