Finding the Fourth Proportional to 142.22, 213.33 and 111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142.22 : 213.33 = 111.98 : x
2. Step 2: Convert to fraction form
   142.22/213.33 = 111.98/x
3. Step 3: Cross multiply
   142.22x = 213.33 × 111.98
4. Step 4: Simplify right side
   142.22x = 23,889.23
5. Step 5: Solve for x
   x = 23,889.23/142.22
6. Step 6: Final answer
   x = 167.97