Finding the Fourth Proportional to 142.71, 196.83 and 93.61

Step by Step Solution

1. Step 1: Write the proportion equation
   142.71 : 196.83 = 93.61 : x
2. Step 2: Convert to fraction form
   142.71/196.83 = 93.61/x
3. Step 3: Cross multiply
   142.71x = 196.83 × 93.61
4. Step 4: Simplify right side
   142.71x = 18,424.40
5. Step 5: Solve for x
   x = 18,424.40/142.71
6. Step 6: Final answer
   x = 129.10