Finding the Fourth Proportional to 13,137.41, 18,129.89 and 7,169.33

Step by Step Solution

1. Step 1: Write the proportion equation
   13,137.41 : 18,129.89 = 7,169.33 : x
2. Step 2: Convert to fraction form
   13,137.41/18,129.89 = 7,169.33/x
3. Step 3: Cross multiply
   13,137.41x = 18,129.89 × 7,169.33
4. Step 4: Simplify right side
   13,137.41x = 129,979,227.52
5. Step 5: Solve for x
   x = 129,979,227.52/13,137.41
6. Step 6: Final answer
   x = 9,893.82