Finding the Fourth Proportional to 111.82, 167.94 and 99.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.82 : 167.94 = 99.10 : x
2. Step 2: Convert to fraction form
   111.82/167.94 = 99.10/x
3. Step 3: Cross multiply
   111.82x = 167.94 × 99.10
4. Step 4: Simplify right side
   111.82x = 16,642.85
5. Step 5: Solve for x
   x = 16,642.85/111.82
6. Step 6: Final answer
   x = 148.84