Finding the Fourth Proportional to 2,719.16, 4,078.30 and 770.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.16 : 4,078.30 = 770.91 : x
2. Step 2: Convert to fraction form
   2,719.16/4,078.30 = 770.91/x
3. Step 3: Cross multiply
   2,719.16x = 4,078.30 × 770.91
4. Step 4: Simplify right side
   2,719.16x = 3,144,002.25
5. Step 5: Solve for x
   x = 3,144,002.25/2,719.16
6. Step 6: Final answer
   x = 1,156.24