Finding the Fourth Proportional to 6,315.36, 8,715.20 and 3,520.96

Step by Step Solution

1. Step 1: Write the proportion equation
   6,315.36 : 8,715.20 = 3,520.96 : x
2. Step 2: Convert to fraction form
   6,315.36/8,715.20 = 3,520.96/x
3. Step 3: Cross multiply
   6,315.36x = 8,715.20 × 3,520.96
4. Step 4: Simplify right side
   6,315.36x = 30,685,870.59
5. Step 5: Solve for x
   x = 30,685,870.59/6,315.36
6. Step 6: Final answer
   x = 4,858.93