Finding the Fourth Proportional to 2,768.40, 4,152.71 and 919.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,768.40 : 4,152.71 = 919.69 : x
2. Step 2: Convert to fraction form
   2,768.40/4,152.71 = 919.69/x
3. Step 3: Cross multiply
   2,768.40x = 4,152.71 × 919.69
4. Step 4: Simplify right side
   2,768.40x = 3,819,197.78
5. Step 5: Solve for x
   x = 3,819,197.78/2,768.40
6. Step 6: Final answer
   x = 1,379.57