Finding the Fourth Proportional to 131.40, 196.56 and 117.72

Step by Step Solution

1. Step 1: Write the proportion equation
   131.40 : 196.56 = 117.72 : x
2. Step 2: Convert to fraction form
   131.40/196.56 = 117.72/x
3. Step 3: Cross multiply
   131.40x = 196.56 × 117.72
4. Step 4: Simplify right side
   131.40x = 23,139.04
5. Step 5: Solve for x
   x = 23,139.04/131.40
6. Step 6: Final answer
   x = 176.10