Finding the Fourth Proportional to 3,578.40, 5,368.56 and 3,519.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578.40 : 5,368.56 = 3,519.72 : x
2. Step 2: Convert to fraction form
   3,578.40/5,368.56 = 3,519.72/x
3. Step 3: Cross multiply
   3,578.40x = 5,368.56 × 3,519.72
4. Step 4: Simplify right side
   3,578.40x = 18,895,828.00
5. Step 5: Solve for x
   x = 18,895,828.00/3,578.40
6. Step 6: Final answer
   x = 5,280.52