Finding the Fourth Proportional to 2,806.09, 3,871.72 and 1,811.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,806.09 : 3,871.72 = 1,811.15 : x
2. Step 2: Convert to fraction form
   2,806.09/3,871.72 = 1,811.15/x
3. Step 3: Cross multiply
   2,806.09x = 3,871.72 × 1,811.15
4. Step 4: Simplify right side
   2,806.09x = 7,012,270.83
5. Step 5: Solve for x
   x = 7,012,270.83/2,806.09
6. Step 6: Final answer
   x = 2,498.95