Finding the Fourth Proportional to 142.89, 196.99 and 117.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142.89 : 196.99 = 117.98 : x
2. Step 2: Convert to fraction form
   142.89/196.99 = 117.98/x
3. Step 3: Cross multiply
   142.89x = 196.99 × 117.98
4. Step 4: Simplify right side
   142.89x = 23,240.88
5. Step 5: Solve for x
   x = 23,240.88/142.89
6. Step 6: Final answer
   x = 162.65