Finding the Fourth Proportional to 131.16, 196.78 and 108.28

Step by Step Solution

1. Step 1: Write the proportion equation
   131.16 : 196.78 = 108.28 : x
2. Step 2: Convert to fraction form
   131.16/196.78 = 108.28/x
3. Step 3: Cross multiply
   131.16x = 196.78 × 108.28
4. Step 4: Simplify right side
   131.16x = 21,307.34
5. Step 5: Solve for x
   x = 21,307.34/131.16
6. Step 6: Final answer
   x = 162.45