Finding the Fourth Proportional to 131.18, 196.50 and 104.05

Step by Step Solution

1. Step 1: Write the proportion equation
   131.18 : 196.50 = 104.05 : x
2. Step 2: Convert to fraction form
   131.18/196.50 = 104.05/x
3. Step 3: Cross multiply
   131.18x = 196.50 × 104.05
4. Step 4: Simplify right side
   131.18x = 20,445.83
5. Step 5: Solve for x
   x = 20,445.83/131.18
6. Step 6: Final answer
   x = 155.86