Finding the Fourth Proportional to 77.72, 116.39 and 50.31

Step by Step Solution

1. Step 1: Write the proportion equation
   77.72 : 116.39 = 50.31 : x
2. Step 2: Convert to fraction form
   77.72/116.39 = 50.31/x
3. Step 3: Cross multiply
   77.72x = 116.39 × 50.31
4. Step 4: Simplify right side
   77.72x = 5,855.33
5. Step 5: Solve for x
   x = 5,855.33/77.72
6. Step 6: Final answer
   x = 75.34