Finding the Fourth Proportional to 131.12, 196.71 and 54.05

Step by Step Solution

1. Step 1: Write the proportion equation
   131.12 : 196.71 = 54.05 : x
2. Step 2: Convert to fraction form
   131.12/196.71 = 54.05/x
3. Step 3: Cross multiply
   131.12x = 196.71 × 54.05
4. Step 4: Simplify right side
   131.12x = 10,632.46
5. Step 5: Solve for x
   x = 10,632.46/131.12
6. Step 6: Final answer
   x = 81.09