Finding the Fourth Proportional to 2,560.96, 3,839.28 and 1,021.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.96 : 3,839.28 = 1,021.12 : x
2. Step 2: Convert to fraction form
   2,560.96/3,839.28 = 1,021.12/x
3. Step 3: Cross multiply
   2,560.96x = 3,839.28 × 1,021.12
4. Step 4: Simplify right side
   2,560.96x = 3,920,365.59
5. Step 5: Solve for x
   x = 3,920,365.59/2,560.96
6. Step 6: Final answer
   x = 1,530.82