Finding the Fourth Proportional to 111.06, 166.34 and 83.92

Step by Step Solution

1. Step 1: Write the proportion equation
   111.06 : 166.34 = 83.92 : x
2. Step 2: Convert to fraction form
   111.06/166.34 = 83.92/x
3. Step 3: Cross multiply
   111.06x = 166.34 × 83.92
4. Step 4: Simplify right side
   111.06x = 13,959.25
5. Step 5: Solve for x
   x = 13,959.25/111.06
6. Step 6: Final answer
   x = 125.69