Finding the Fourth Proportional to 2,081.12, 3,120.39 and 1,025.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.12 : 3,120.39 = 1,025.60 : x
2. Step 2: Convert to fraction form
   2,081.12/3,120.39 = 1,025.60/x
3. Step 3: Cross multiply
   2,081.12x = 3,120.39 × 1,025.60
4. Step 4: Simplify right side
   2,081.12x = 3,200,256.38
5. Step 5: Solve for x
   x = 3,200,256.38/2,081.12
6. Step 6: Final answer
   x = 1,537.76