Finding the Fourth Proportional to 2,718.56, 4,077.72 and 770.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,718.56 : 4,077.72 = 770.72 : x
2. Step 2: Convert to fraction form
   2,718.56/4,077.72 = 770.72/x
3. Step 3: Cross multiply
   2,718.56x = 4,077.72 × 770.72
4. Step 4: Simplify right side
   2,718.56x = 3,142,780.36
5. Step 5: Solve for x
   x = 3,142,780.36/2,718.56
6. Step 6: Final answer
   x = 1,156.05