Finding the Fourth Proportional to 142.52, 196.78 and 90.08

Step by Step Solution

1. Step 1: Write the proportion equation
   142.52 : 196.78 = 90.08 : x
2. Step 2: Convert to fraction form
   142.52/196.78 = 90.08/x
3. Step 3: Cross multiply
   142.52x = 196.78 × 90.08
4. Step 4: Simplify right side
   142.52x = 17,725.94
5. Step 5: Solve for x
   x = 17,725.94/142.52
6. Step 6: Final answer
   x = 124.38