Finding the Fourth Proportional to 2,638.57, 3,640.91 and 1,519.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.57 : 3,640.91 = 1,519.87 : x
2. Step 2: Convert to fraction form
   2,638.57/3,640.91 = 1,519.87/x
3. Step 3: Cross multiply
   2,638.57x = 3,640.91 × 1,519.87
4. Step 4: Simplify right side
   2,638.57x = 5,533,712.53
5. Step 5: Solve for x
   x = 5,533,712.53/2,638.57
6. Step 6: Final answer
   x = 2,097.24