Finding the Fourth Proportional to 3,521.60, 5,280.43 and 1,443.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,521.60 : 5,280.43 = 1,443.05 : x
2. Step 2: Convert to fraction form
   3,521.60/5,280.43 = 1,443.05/x
3. Step 3: Cross multiply
   3,521.60x = 5,280.43 × 1,443.05
4. Step 4: Simplify right side
   3,521.60x = 7,619,924.51
5. Step 5: Solve for x
   x = 7,619,924.51/3,521.60
6. Step 6: Final answer
   x = 2,163.77