Finding the Fourth Proportional to 131.18, 196.61 and 104.02

Step by Step Solution

1. Step 1: Write the proportion equation
   131.18 : 196.61 = 104.02 : x
2. Step 2: Convert to fraction form
   131.18/196.61 = 104.02/x
3. Step 3: Cross multiply
   131.18x = 196.61 × 104.02
4. Step 4: Simplify right side
   131.18x = 20,451.37
5. Step 5: Solve for x
   x = 20,451.37/131.18
6. Step 6: Final answer
   x = 155.90