Finding the Fourth Proportional to 3,519.72, 5,280.18 and 1,328.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,519.72 : 5,280.18 = 1,328.76 : x
2. Step 2: Convert to fraction form
   3,519.72/5,280.18 = 1,328.76/x
3. Step 3: Cross multiply
   3,519.72x = 5,280.18 × 1,328.76
4. Step 4: Simplify right side
   3,519.72x = 7,016,091.98
5. Step 5: Solve for x
   x = 7,016,091.98/3,519.72
6. Step 6: Final answer
   x = 1,993.37