Finding the Fourth Proportional to 196.61, 271.50 and 131.15

Step by Step Solution

1. Step 1: Write the proportion equation
   196.61 : 271.50 = 131.15 : x
2. Step 2: Convert to fraction form
   196.61/271.50 = 131.15/x
3. Step 3: Cross multiply
   196.61x = 271.50 × 131.15
4. Step 4: Simplify right side
   196.61x = 35,607.23
5. Step 5: Solve for x
   x = 35,607.23/196.61
6. Step 6: Final answer
   x = 181.11