Finding the Fourth Proportional to 142.78, 196.81 and 93.55

Step by Step Solution

1. Step 1: Write the proportion equation
   142.78 : 196.81 = 93.55 : x
2. Step 2: Convert to fraction form
   142.78/196.81 = 93.55/x
3. Step 3: Cross multiply
   142.78x = 196.81 × 93.55
4. Step 4: Simplify right side
   142.78x = 18,411.58
5. Step 5: Solve for x
   x = 18,411.58/142.78
6. Step 6: Final answer
   x = 128.95