Finding the Fourth Proportional to 5,411.28, 8,109.82 and 2,776.56

Step by Step Solution

1. Step 1: Write the proportion equation
   5,411.28 : 8,109.82 = 2,776.56 : x
2. Step 2: Convert to fraction form
   5,411.28/8,109.82 = 2,776.56/x
3. Step 3: Cross multiply
   5,411.28x = 8,109.82 × 2,776.56
4. Step 4: Simplify right side
   5,411.28x = 22,517,401.82
5. Step 5: Solve for x
   x = 22,517,401.82/5,411.28
6. Step 6: Final answer
   x = 4,161.20