Finding the Fourth Proportional to 131.89, 197.78 and 50.72

Step by Step Solution

1. Step 1: Write the proportion equation
   131.89 : 197.78 = 50.72 : x
2. Step 2: Convert to fraction form
   131.89/197.78 = 50.72/x
3. Step 3: Cross multiply
   131.89x = 197.78 × 50.72
4. Step 4: Simplify right side
   131.89x = 10,031.40
5. Step 5: Solve for x
   x = 10,031.40/131.89
6. Step 6: Final answer
   x = 76.06