Finding the Fourth Proportional to 2,083.40, 2,875.10 and 1,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,083.40 : 2,875.10 = 1,139.18 : x
2. Step 2: Convert to fraction form
   2,083.40/2,875.10 = 1,139.18/x
3. Step 3: Cross multiply
   2,083.40x = 2,875.10 × 1,139.18
4. Step 4: Simplify right side
   2,083.40x = 3,275,256.42
5. Step 5: Solve for x
   x = 3,275,256.42/2,083.40
6. Step 6: Final answer
   x = 1,572.07