Finding the Fourth Proportional to 2,760.24, 4,138.78 and 910.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,760.24 : 4,138.78 = 910.86 : x
2. Step 2: Convert to fraction form
   2,760.24/4,138.78 = 910.86/x
3. Step 3: Cross multiply
   2,760.24x = 4,138.78 × 910.86
4. Step 4: Simplify right side
   2,760.24x = 3,769,849.15
5. Step 5: Solve for x
   x = 3,769,849.15/2,760.24
6. Step 6: Final answer
   x = 1,365.77