Finding the Fourth Proportional to 6,218.71, 8,581.95 and 3,530.10

Step by Step Solution

1. Step 1: Write the proportion equation
   6,218.71 : 8,581.95 = 3,530.10 : x
2. Step 2: Convert to fraction form
   6,218.71/8,581.95 = 3,530.10/x
3. Step 3: Cross multiply
   6,218.71x = 8,581.95 × 3,530.10
4. Step 4: Simplify right side
   6,218.71x = 30,295,141.70
5. Step 5: Solve for x
   x = 30,295,141.70/6,218.71
6. Step 6: Final answer
   x = 4,871.61