Finding the Fourth Proportional to 12,718.72, 17,551.98 and 7,130.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,718.72 : 17,551.98 = 7,130.08 : x
2. Step 2: Convert to fraction form
   12,718.72/17,551.98 = 7,130.08/x
3. Step 3: Cross multiply
   12,718.72x = 17,551.98 × 7,130.08
4. Step 4: Simplify right side
   12,718.72x = 125,147,021.56
5. Step 5: Solve for x
   x = 125,147,021.56/12,718.72
6. Step 6: Final answer
   x = 9,839.59