Finding the Fourth Proportional to 2,719.42, 4,078.91 and 771.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.42 : 4,078.91 = 771.37 : x
2. Step 2: Convert to fraction form
   2,719.42/4,078.91 = 771.37/x
3. Step 3: Cross multiply
   2,719.42x = 4,078.91 × 771.37
4. Step 4: Simplify right side
   2,719.42x = 3,146,340.54
5. Step 5: Solve for x
   x = 3,146,340.54/2,719.42
6. Step 6: Final answer
   x = 1,156.99