Finding the Fourth Proportional to 6,806.68, 10,215.61 and 3,520.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,806.68 : 10,215.61 = 3,520.78 : x
2. Step 2: Convert to fraction form
   6,806.68/10,215.61 = 3,520.78/x
3. Step 3: Cross multiply
   6,806.68x = 10,215.61 × 3,520.78
4. Step 4: Simplify right side
   6,806.68x = 35,966,915.38
5. Step 5: Solve for x
   x = 35,966,915.38/6,806.68
6. Step 6: Final answer
   x = 5,284.06