Finding the Fourth Proportional to 131.37, 196.97 and 53.21

Step by Step Solution

1. Step 1: Write the proportion equation
   131.37 : 196.97 = 53.21 : x
2. Step 2: Convert to fraction form
   131.37/196.97 = 53.21/x
3. Step 3: Cross multiply
   131.37x = 196.97 × 53.21
4. Step 4: Simplify right side
   131.37x = 10,479.79
5. Step 5: Solve for x
   x = 10,479.79/131.37
6. Step 6: Final answer
   x = 79.78