Finding the Fourth Proportional to 111.17, 166.82 and 83.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111.17 : 166.82 = 83.98 : x
2. Step 2: Convert to fraction form
   111.17/166.82 = 83.98/x
3. Step 3: Cross multiply
   111.17x = 166.82 × 83.98
4. Step 4: Simplify right side
   111.17x = 14,009.34
5. Step 5: Solve for x
   x = 14,009.34/111.17
6. Step 6: Final answer
   x = 126.02