Finding the Fourth Proportional to 13,136.77, 18,128.82 and 7,168.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,136.77 : 18,128.82 = 7,168.47 : x
2. Step 2: Convert to fraction form
   13,136.77/18,128.82 = 7,168.47/x
3. Step 3: Cross multiply
   13,136.77x = 18,128.82 × 7,168.47
4. Step 4: Simplify right side
   13,136.77x = 129,955,902.31
5. Step 5: Solve for x
   x = 129,955,902.31/13,136.77
6. Step 6: Final answer
   x = 9,892.53