Finding the Fourth Proportional to 131.70, 196.61 and 111.15

Step by Step Solution

1. Step 1: Write the proportion equation
   131.70 : 196.61 = 111.15 : x
2. Step 2: Convert to fraction form
   131.70/196.61 = 111.15/x
3. Step 3: Cross multiply
   131.70x = 196.61 × 111.15
4. Step 4: Simplify right side
   131.70x = 21,853.20
5. Step 5: Solve for x
   x = 21,853.20/131.70
6. Step 6: Final answer
   x = 165.93