Finding the Fourth Proportional to 3,969.28, 5,477.52 and 2,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.28 : 5,477.52 = 2,290.72 : x
2. Step 2: Convert to fraction form
   3,969.28/5,477.52 = 2,290.72/x
3. Step 3: Cross multiply
   3,969.28x = 5,477.52 × 2,290.72
4. Step 4: Simplify right side
   3,969.28x = 12,547,464.61
5. Step 5: Solve for x
   x = 12,547,464.61/3,969.28
6. Step 6: Final answer
   x = 3,161.14