Finding the Fourth Proportional to 2,082.72, 2,874.23 and 1,138.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.72 : 2,874.23 = 1,138.57 : x
2. Step 2: Convert to fraction form
   2,082.72/2,874.23 = 1,138.57/x
3. Step 3: Cross multiply
   2,082.72x = 2,874.23 × 1,138.57
4. Step 4: Simplify right side
   2,082.72x = 3,272,513.54
5. Step 5: Solve for x
   x = 3,272,513.54/2,082.72
6. Step 6: Final answer
   x = 1,571.27