Finding the Fourth Proportional to 142.32, 196.29 and 100.87

Step by Step Solution

1. Step 1: Write the proportion equation
   142.32 : 196.29 = 100.87 : x
2. Step 2: Convert to fraction form
   142.32/196.29 = 100.87/x
3. Step 3: Cross multiply
   142.32x = 196.29 × 100.87
4. Step 4: Simplify right side
   142.32x = 19,799.77
5. Step 5: Solve for x
   x = 19,799.77/142.32
6. Step 6: Final answer
   x = 139.12