Finding the Fourth Proportional to 8,499.28, 12,739.20 and 3,822.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499.28 : 12,739.20 = 3,822.88 : x
2. Step 2: Convert to fraction form
   8,499.28/12,739.20 = 3,822.88/x
3. Step 3: Cross multiply
   8,499.28x = 12,739.20 × 3,822.88
4. Step 4: Simplify right side
   8,499.28x = 48,700,432.90
5. Step 5: Solve for x
   x = 48,700,432.90/8,499.28
6. Step 6: Final answer
   x = 5,729.95