Finding the Fourth Proportional to 131.15, 196.73 and 54.10

Step by Step Solution

1. Step 1: Write the proportion equation
   131.15 : 196.73 = 54.10 : x
2. Step 2: Convert to fraction form
   131.15/196.73 = 54.10/x
3. Step 3: Cross multiply
   131.15x = 196.73 × 54.10
4. Step 4: Simplify right side
   131.15x = 10,642.33
5. Step 5: Solve for x
   x = 10,642.33/131.15
6. Step 6: Final answer
   x = 81.14