Finding the Fourth Proportional to 131.61, 196.47 and 121.98

Step by Step Solution

1. Step 1: Write the proportion equation
   131.61 : 196.47 = 121.98 : x
2. Step 2: Convert to fraction form
   131.61/196.47 = 121.98/x
3. Step 3: Cross multiply
   131.61x = 196.47 × 121.98
4. Step 4: Simplify right side
   131.61x = 23,965.41
5. Step 5: Solve for x
   x = 23,965.41/131.61
6. Step 6: Final answer
   x = 182.09