Finding the Fourth Proportional to 111.98, 168.01 and 66.35

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 168.01 = 66.35 : x
2. Step 2: Convert to fraction form
   111.98/168.01 = 66.35/x
3. Step 3: Cross multiply
   111.98x = 168.01 × 66.35
4. Step 4: Simplify right side
   111.98x = 11,147.72
5. Step 5: Solve for x
   x = 11,147.72/111.98
6. Step 6: Final answer
   x = 99.55