Finding the Fourth Proportional to 6,345.87, 8,757.21 and 3,513.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,345.87 : 8,757.21 = 3,513.30 : x
2. Step 2: Convert to fraction form
   6,345.87/8,757.21 = 3,513.30/x
3. Step 3: Cross multiply
   6,345.87x = 8,757.21 × 3,513.30
4. Step 4: Simplify right side
   6,345.87x = 30,766,705.89
5. Step 5: Solve for x
   x = 30,766,705.89/6,345.87
6. Step 6: Final answer
   x = 4,848.30