Finding the Fourth Proportional to 2,515.05, 3,769.83 and 1,280.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.05 : 3,769.83 = 1,280.76 : x
2. Step 2: Convert to fraction form
   2,515.05/3,769.83 = 1,280.76/x
3. Step 3: Cross multiply
   2,515.05x = 3,769.83 × 1,280.76
4. Step 4: Simplify right side
   2,515.05x = 4,828,228.62
5. Step 5: Solve for x
   x = 4,828,228.62/2,515.05
6. Step 6: Final answer
   x = 1,919.74