Finding the Fourth Proportional to 2,083.31, 2,874.87 and 1,139.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,083.31 : 2,874.87 = 1,139.05 : x
2. Step 2: Convert to fraction form
   2,083.31/2,874.87 = 1,139.05/x
3. Step 3: Cross multiply
   2,083.31x = 2,874.87 × 1,139.05
4. Step 4: Simplify right side
   2,083.31x = 3,274,620.67
5. Step 5: Solve for x
   x = 3,274,620.67/2,083.31
6. Step 6: Final answer
   x = 1,571.84