Finding the Fourth Proportional to 142.50, 196.74 and 90.84

Step by Step Solution

1. Step 1: Write the proportion equation
   142.50 : 196.74 = 90.84 : x
2. Step 2: Convert to fraction form
   142.50/196.74 = 90.84/x
3. Step 3: Cross multiply
   142.50x = 196.74 × 90.84
4. Step 4: Simplify right side
   142.50x = 17,871.86
5. Step 5: Solve for x
   x = 17,871.86/142.50
6. Step 6: Final answer
   x = 125.42