Finding the Fourth Proportional to 142.67, 196.79 and 131.05

Step by Step Solution

1. Step 1: Write the proportion equation
   142.67 : 196.79 = 131.05 : x
2. Step 2: Convert to fraction form
   142.67/196.79 = 131.05/x
3. Step 3: Cross multiply
   142.67x = 196.79 × 131.05
4. Step 4: Simplify right side
   142.67x = 25,789.33
5. Step 5: Solve for x
   x = 25,789.33/142.67
6. Step 6: Final answer
   x = 180.76