Finding the Fourth Proportional to 142.53, 196.71 and 90.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142.53 : 196.71 = 90.10 : x
2. Step 2: Convert to fraction form
   142.53/196.71 = 90.10/x
3. Step 3: Cross multiply
   142.53x = 196.71 × 90.10
4. Step 4: Simplify right side
   142.53x = 17,723.57
5. Step 5: Solve for x
   x = 17,723.57/142.53
6. Step 6: Final answer
   x = 124.35