Finding the Fourth Proportional to 1,815.69, 2,488.20 and 1,640.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.69 : 2,488.20 = 1,640.73 : x
2. Step 2: Convert to fraction form
   1,815.69/2,488.20 = 1,640.73/x
3. Step 3: Cross multiply
   1,815.69x = 2,488.20 × 1,640.73
4. Step 4: Simplify right side
   1,815.69x = 4,082,464.39
5. Step 5: Solve for x
   x = 4,082,464.39/1,815.69
6. Step 6: Final answer
   x = 2,248.44