Finding the Fourth Proportional to 131.16, 196.56 and 123.60

Step by Step Solution

1. Step 1: Write the proportion equation
   131.16 : 196.56 = 123.60 : x
2. Step 2: Convert to fraction form
   131.16/196.56 = 123.60/x
3. Step 3: Cross multiply
   131.16x = 196.56 × 123.60
4. Step 4: Simplify right side
   131.16x = 24,294.82
5. Step 5: Solve for x
   x = 24,294.82/131.16
6. Step 6: Final answer
   x = 185.23