Finding the Fourth Proportional to 12,825.76, 17,688.72 and 8,102.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,825.76 : 17,688.72 = 8,102.56 : x
2. Step 2: Convert to fraction form
   12,825.76/17,688.72 = 8,102.56/x
3. Step 3: Cross multiply
   12,825.76x = 17,688.72 × 8,102.56
4. Step 4: Simplify right side
   12,825.76x = 143,323,915.12
5. Step 5: Solve for x
   x = 143,323,915.12/12,825.76
6. Step 6: Final answer
   x = 11,174.69