Finding the Fourth Proportional to 2,716.56, 4,074.72 and 768.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,716.56 : 4,074.72 = 768.72 : x
2. Step 2: Convert to fraction form
   2,716.56/4,074.72 = 768.72/x
3. Step 3: Cross multiply
   2,716.56x = 4,074.72 × 768.72
4. Step 4: Simplify right side
   2,716.56x = 3,132,318.76
5. Step 5: Solve for x
   x = 3,132,318.76/2,716.56
6. Step 6: Final answer
   x = 1,153.05