Finding the Fourth Proportional to 13,120.34, 18,105.71 and 7,152.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.34 : 18,105.71 = 7,152.13 : x
2. Step 2: Convert to fraction form
   13,120.34/18,105.71 = 7,152.13/x
3. Step 3: Cross multiply
   13,120.34x = 18,105.71 × 7,152.13
4. Step 4: Simplify right side
   13,120.34x = 129,494,301.13
5. Step 5: Solve for x
   x = 129,494,301.13/13,120.34
6. Step 6: Final answer
   x = 9,869.74