Finding the Fourth Proportional to 13,072.78, 18,040.38 and 7,104.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.78 : 18,040.38 = 7,104.34 : x
2. Step 2: Convert to fraction form
   13,072.78/18,040.38 = 7,104.34/x
3. Step 3: Cross multiply
   13,072.78x = 18,040.38 × 7,104.34
4. Step 4: Simplify right side
   13,072.78x = 128,164,993.25
5. Step 5: Solve for x
   x = 128,164,993.25/13,072.78
6. Step 6: Final answer
   x = 9,803.96