Finding the Fourth Proportional to 142.73, 196.90 and 101.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142.73 : 196.90 = 101.31 : x
2. Step 2: Convert to fraction form
   142.73/196.90 = 101.31/x
3. Step 3: Cross multiply
   142.73x = 196.90 × 101.31
4. Step 4: Simplify right side
   142.73x = 19,947.52
5. Step 5: Solve for x
   x = 19,947.52/142.73
6. Step 6: Final answer
   x = 139.76