Finding the Fourth Proportional to 131.16, 196.78 and 104.12

Step by Step Solution

1. Step 1: Write the proportion equation
   131.16 : 196.78 = 104.12 : x
2. Step 2: Convert to fraction form
   131.16/196.78 = 104.12/x
3. Step 3: Cross multiply
   131.16x = 196.78 × 104.12
4. Step 4: Simplify right side
   131.16x = 20,488.73
5. Step 5: Solve for x
   x = 20,488.73/131.16
6. Step 6: Final answer
   x = 156.21