Finding the Fourth Proportional to 13,136.72, 18,128.43 and 7,168.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,136.72 : 18,128.43 = 7,168.23 : x
2. Step 2: Convert to fraction form
   13,136.72/18,128.43 = 7,168.23/x
3. Step 3: Cross multiply
   13,136.72x = 18,128.43 × 7,168.23
4. Step 4: Simplify right side
   13,136.72x = 129,948,755.78
5. Step 5: Solve for x
   x = 129,948,755.78/13,136.72
6. Step 6: Final answer
   x = 9,892.03