Finding the Fourth Proportional to 2,805.49, 3,869.60 and 1,811.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.49 : 3,869.60 = 1,811.15 : x
2. Step 2: Convert to fraction form
   2,805.49/3,869.60 = 1,811.15/x
3. Step 3: Cross multiply
   2,805.49x = 3,869.60 × 1,811.15
4. Step 4: Simplify right side
   2,805.49x = 7,008,426.04
5. Step 5: Solve for x
   x = 7,008,426.04/2,805.49
6. Step 6: Final answer
   x = 2,498.11