Finding the Fourth Proportional to 6,821.28, 10,233.72 and 3,120.48

Step by Step Solution

1. Step 1: Write the proportion equation
   6,821.28 : 10,233.72 = 3,120.48 : x
2. Step 2: Convert to fraction form
   6,821.28/10,233.72 = 3,120.48/x
3. Step 3: Cross multiply
   6,821.28x = 10,233.72 × 3,120.48
4. Step 4: Simplify right side
   6,821.28x = 31,934,118.59
5. Step 5: Solve for x
   x = 31,934,118.59/6,821.28
6. Step 6: Final answer
   x = 4,681.54