Finding the Fourth Proportional to 2,719.89, 4,079.03 and 771.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.89 : 4,079.03 = 771.57 : x
2. Step 2: Convert to fraction form
   2,719.89/4,079.03 = 771.57/x
3. Step 3: Cross multiply
   2,719.89x = 4,079.03 × 771.57
4. Step 4: Simplify right side
   2,719.89x = 3,147,253.32
5. Step 5: Solve for x
   x = 3,147,253.32/2,719.89
6. Step 6: Final answer
   x = 1,157.13