Finding the Fourth Proportional to 2,719.34, 4,079.21 and 771.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.34 : 4,079.21 = 771.69 : x
2. Step 2: Convert to fraction form
   2,719.34/4,079.21 = 771.69/x
3. Step 3: Cross multiply
   2,719.34x = 4,079.21 × 771.69
4. Step 4: Simplify right side
   2,719.34x = 3,147,881.71
5. Step 5: Solve for x
   x = 3,147,881.71/2,719.34
6. Step 6: Final answer
   x = 1,157.59