Finding the Fourth Proportional to 131.18, 196.64 and 54.10

Step by Step Solution

1. Step 1: Write the proportion equation
   131.18 : 196.64 = 54.10 : x
2. Step 2: Convert to fraction form
   131.18/196.64 = 54.10/x
3. Step 3: Cross multiply
   131.18x = 196.64 × 54.10
4. Step 4: Simplify right side
   131.18x = 10,638.22
5. Step 5: Solve for x
   x = 10,638.22/131.18
6. Step 6: Final answer
   x = 81.10