Finding the Fourth Proportional to 2,820.57, 3,891.09 and 1,826.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.57 : 3,891.09 = 1,826.18 : x
2. Step 2: Convert to fraction form
   2,820.57/3,891.09 = 1,826.18/x
3. Step 3: Cross multiply
   2,820.57x = 3,891.09 × 1,826.18
4. Step 4: Simplify right side
   2,820.57x = 7,105,811.28
5. Step 5: Solve for x
   x = 7,105,811.28/2,820.57
6. Step 6: Final answer
   x = 2,519.28