Finding the Fourth Proportional to 6,882.78, 10,321.55 and 2,931.55

Step by Step Solution

1. Step 1: Write the proportion equation
   6,882.78 : 10,321.55 = 2,931.55 : x
2. Step 2: Convert to fraction form
   6,882.78/10,321.55 = 2,931.55/x
3. Step 3: Cross multiply
   6,882.78x = 10,321.55 × 2,931.55
4. Step 4: Simplify right side
   6,882.78x = 30,258,139.90
5. Step 5: Solve for x
   x = 30,258,139.90/6,882.78
6. Step 6: Final answer
   x = 4,396.21