Finding the Fourth Proportional to 12,717.54, 17,549.73 and 7,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,717.54 : 17,549.73 = 7,128.18 : x
2. Step 2: Convert to fraction form
   12,717.54/17,549.73 = 7,128.18/x
3. Step 3: Cross multiply
   12,717.54x = 17,549.73 × 7,128.18
4. Step 4: Simplify right side
   12,717.54x = 125,097,634.39
5. Step 5: Solve for x
   x = 125,097,634.39/12,717.54
6. Step 6: Final answer
   x = 9,836.62