Finding the Fourth Proportional to 13,120.29, 18,105.12 and 7,456.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.29 : 18,105.12 = 7,456.23 : x
2. Step 2: Convert to fraction form
   13,120.29/18,105.12 = 7,456.23/x
3. Step 3: Cross multiply
   13,120.29x = 18,105.12 × 7,456.23
4. Step 4: Simplify right side
   13,120.29x = 134,995,938.90
5. Step 5: Solve for x
   x = 134,995,938.90/13,120.29
6. Step 6: Final answer
   x = 10,289.10