Finding the Fourth Proportional to 2,083.91, 2,875.79 and 1,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,083.91 : 2,875.79 = 1,139.72 : x
2. Step 2: Convert to fraction form
   2,083.91/2,875.79 = 1,139.72/x
3. Step 3: Cross multiply
   2,083.91x = 2,875.79 × 1,139.72
4. Step 4: Simplify right side
   2,083.91x = 3,277,583.85
5. Step 5: Solve for x
   x = 3,277,583.85/2,083.91
6. Step 6: Final answer
   x = 1,572.81