Finding the Fourth Proportional to 142.31, 196.19 and 100.96

Step by Step Solution

1. Step 1: Write the proportion equation
   142.31 : 196.19 = 100.96 : x
2. Step 2: Convert to fraction form
   142.31/196.19 = 100.96/x
3. Step 3: Cross multiply
   142.31x = 196.19 × 100.96
4. Step 4: Simplify right side
   142.31x = 19,807.83
5. Step 5: Solve for x
   x = 19,807.83/142.31
6. Step 6: Final answer
   x = 139.19