Finding the Fourth Proportional to 111.78, 166.74 and 98.82

Step by Step Solution

1. Step 1: Write the proportion equation
   111.78 : 166.74 = 98.82 : x
2. Step 2: Convert to fraction form
   111.78/166.74 = 98.82/x
3. Step 3: Cross multiply
   111.78x = 166.74 × 98.82
4. Step 4: Simplify right side
   111.78x = 16,477.25
5. Step 5: Solve for x
   x = 16,477.25/111.78
6. Step 6: Final answer
   x = 147.41