Finding the Fourth Proportional to 196.85, 271.82 and 123.18

Step by Step Solution

1. Step 1: Write the proportion equation
   196.85 : 271.82 = 123.18 : x
2. Step 2: Convert to fraction form
   196.85/271.82 = 123.18/x
3. Step 3: Cross multiply
   196.85x = 271.82 × 123.18
4. Step 4: Simplify right side
   196.85x = 33,482.17
5. Step 5: Solve for x
   x = 33,482.17/196.85
6. Step 6: Final answer
   x = 170.09