Finding the Fourth Proportional to 131.09, 196.38 and 105.29

Step by Step Solution

1. Step 1: Write the proportion equation
   131.09 : 196.38 = 105.29 : x
2. Step 2: Convert to fraction form
   131.09/196.38 = 105.29/x
3. Step 3: Cross multiply
   131.09x = 196.38 × 105.29
4. Step 4: Simplify right side
   131.09x = 20,676.60
5. Step 5: Solve for x
   x = 20,676.60/131.09
6. Step 6: Final answer
   x = 157.73