Finding the Fourth Proportional to 12,820.28, 17,682.88 and 8,335.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.28 : 17,682.88 = 8,335.76 : x
2. Step 2: Convert to fraction form
   12,820.28/17,682.88 = 8,335.76/x
3. Step 3: Cross multiply
   12,820.28x = 17,682.88 × 8,335.76
4. Step 4: Simplify right side
   12,820.28x = 147,400,243.79
5. Step 5: Solve for x
   x = 147,400,243.79/12,820.28
6. Step 6: Final answer
   x = 11,497.43