Finding the Fourth Proportional to 13,040.72, 17,995.92 and 7,072.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,040.72 : 17,995.92 = 7,072.16 : x
2. Step 2: Convert to fraction form
   13,040.72/17,995.92 = 7,072.16/x
3. Step 3: Cross multiply
   13,040.72x = 17,995.92 × 7,072.16
4. Step 4: Simplify right side
   13,040.72x = 127,270,025.59
5. Step 5: Solve for x
   x = 127,270,025.59/13,040.72
6. Step 6: Final answer
   x = 9,759.43