Finding the Fourth Proportional to 6,216.58, 8,578.81 and 3,528.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,216.58 : 8,578.81 = 3,528.30 : x
2. Step 2: Convert to fraction form
   6,216.58/8,578.81 = 3,528.30/x
3. Step 3: Cross multiply
   6,216.58x = 8,578.81 × 3,528.30
4. Step 4: Simplify right side
   6,216.58x = 30,268,615.32
5. Step 5: Solve for x
   x = 30,268,615.32/6,216.58
6. Step 6: Final answer
   x = 4,869.01