Finding the Fourth Proportional to 13,136.69, 18,128.56 and 7,168.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,136.69 : 18,128.56 = 7,168.34 : x
2. Step 2: Convert to fraction form
   13,136.69/18,128.56 = 7,168.34/x
3. Step 3: Cross multiply
   13,136.69x = 18,128.56 × 7,168.34
4. Step 4: Simplify right side
   13,136.69x = 129,951,681.79
5. Step 5: Solve for x
   x = 129,951,681.79/13,136.69
6. Step 6: Final answer
   x = 9,892.27