Finding the Fourth Proportional to 111.10, 166.46 and 83.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 166.46 = 83.98 : x
2. Step 2: Convert to fraction form
   111.10/166.46 = 83.98/x
3. Step 3: Cross multiply
   111.10x = 166.46 × 83.98
4. Step 4: Simplify right side
   111.10x = 13,979.31
5. Step 5: Solve for x
   x = 13,979.31/111.10
6. Step 6: Final answer
   x = 125.83