Finding the Fourth Proportional to 12,717.16, 17,549.62 and 7,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,717.16 : 17,549.62 = 7,128.16 : x
2. Step 2: Convert to fraction form
   12,717.16/17,549.62 = 7,128.16/x
3. Step 3: Cross multiply
   12,717.16x = 17,549.62 × 7,128.16
4. Step 4: Simplify right side
   12,717.16x = 125,096,499.30
5. Step 5: Solve for x
   x = 125,096,499.30/12,717.16
6. Step 6: Final answer
   x = 9,836.83