Finding the Fourth Proportional to 131.85, 196.94 and 104.72

Step by Step Solution

1. Step 1: Write the proportion equation
   131.85 : 196.94 = 104.72 : x
2. Step 2: Convert to fraction form
   131.85/196.94 = 104.72/x
3. Step 3: Cross multiply
   131.85x = 196.94 × 104.72
4. Step 4: Simplify right side
   131.85x = 20,622.83
5. Step 5: Solve for x
   x = 20,622.83/131.85
6. Step 6: Final answer
   x = 156.41