Finding the Fourth Proportional to 77.72, 116.58 and 50.72

Step by Step Solution

1. Step 1: Write the proportion equation
   77.72 : 116.58 = 50.72 : x
2. Step 2: Convert to fraction form
   77.72/116.58 = 50.72/x
3. Step 3: Cross multiply
   77.72x = 116.58 × 50.72
4. Step 4: Simplify right side
   77.72x = 5,912.94
5. Step 5: Solve for x
   x = 5,912.94/77.72
6. Step 6: Final answer
   x = 76.08