Finding the Fourth Proportional to 142.60, 196.82 and 90.11

Step by Step Solution

1. Step 1: Write the proportion equation
   142.60 : 196.82 = 90.11 : x
2. Step 2: Convert to fraction form
   142.60/196.82 = 90.11/x
3. Step 3: Cross multiply
   142.60x = 196.82 × 90.11
4. Step 4: Simplify right side
   142.60x = 17,734.72
5. Step 5: Solve for x
   x = 17,734.72/142.60
6. Step 6: Final answer
   x = 124.37