Finding the Fourth Proportional to 2,083.72, 2,875.55 and 1,139.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,083.72 : 2,875.55 = 1,139.53 : x
2. Step 2: Convert to fraction form
   2,083.72/2,875.55 = 1,139.53/x
3. Step 3: Cross multiply
   2,083.72x = 2,875.55 × 1,139.53
4. Step 4: Simplify right side
   2,083.72x = 3,276,762.60
5. Step 5: Solve for x
   x = 3,276,762.60/2,083.72
6. Step 6: Final answer
   x = 1,572.56