Finding the Fourth Proportional to 13,105.68, 18,085.94 and 7,137.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.68 : 18,085.94 = 7,137.37 : x
2. Step 2: Convert to fraction form
   13,105.68/18,085.94 = 7,137.37/x
3. Step 3: Cross multiply
   13,105.68x = 18,085.94 × 7,137.37
4. Step 4: Simplify right side
   13,105.68x = 129,086,045.58
5. Step 5: Solve for x
   x = 129,086,045.58/13,105.68
6. Step 6: Final answer
   x = 9,849.63