Finding the Fourth Proportional to 142.29, 196.41 and 89.91

Step by Step Solution

1. Step 1: Write the proportion equation
   142.29 : 196.41 = 89.91 : x
2. Step 2: Convert to fraction form
   142.29/196.41 = 89.91/x
3. Step 3: Cross multiply
   142.29x = 196.41 × 89.91
4. Step 4: Simplify right side
   142.29x = 17,659.22
5. Step 5: Solve for x
   x = 17,659.22/142.29
6. Step 6: Final answer
   x = 124.11