Finding the Fourth Proportional to 3,891.36, 5,812.22 and 3,520.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891.36 : 5,812.22 = 3,520.59 : x
2. Step 2: Convert to fraction form
   3,891.36/5,812.22 = 3,520.59/x
3. Step 3: Cross multiply
   3,891.36x = 5,812.22 × 3,520.59
4. Step 4: Simplify right side
   3,891.36x = 20,462,443.61
5. Step 5: Solve for x
   x = 20,462,443.61/3,891.36
6. Step 6: Final answer
   x = 5,258.43