Finding the Fourth Proportional to 131.49, 196.34 and 111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   131.49 : 196.34 = 111.21 : x
2. Step 2: Convert to fraction form
   131.49/196.34 = 111.21/x
3. Step 3: Cross multiply
   131.49x = 196.34 × 111.21
4. Step 4: Simplify right side
   131.49x = 21,834.42
5. Step 5: Solve for x
   x = 21,834.42/131.49
6. Step 6: Final answer
   x = 166.05