Finding the Fourth Proportional to 2,825.87, 3,896.15 and 1,815.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,825.87 : 3,896.15 = 1,815.78 : x
2. Step 2: Convert to fraction form
   2,825.87/3,896.15 = 1,815.78/x
3. Step 3: Cross multiply
   2,825.87x = 3,896.15 × 1,815.78
4. Step 4: Simplify right side
   2,825.87x = 7,074,542.17
5. Step 5: Solve for x
   x = 7,074,542.17/2,825.87
6. Step 6: Final answer
   x = 2,503.50