Finding the Fourth Proportional to 2,840.96, 3,920.45 and 2,757.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,840.96 : 3,920.45 = 2,757.12 : x
2. Step 2: Convert to fraction form
   2,840.96/3,920.45 = 2,757.12/x
3. Step 3: Cross multiply
   2,840.96x = 3,920.45 × 2,757.12
4. Step 4: Simplify right side
   2,840.96x = 10,809,137.32
5. Step 5: Solve for x
   x = 10,809,137.32/2,840.96
6. Step 6: Final answer
   x = 3,804.75