Finding the Fourth Proportional to 13,105.59, 18,085.46 and 7,137.51

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.59 : 18,085.46 = 7,137.51 : x
2. Step 2: Convert to fraction form
   13,105.59/18,085.46 = 7,137.51/x
3. Step 3: Cross multiply
   13,105.59x = 18,085.46 × 7,137.51
4. Step 4: Simplify right side
   13,105.59x = 129,085,115.92
5. Step 5: Solve for x
   x = 129,085,115.92/13,105.59
6. Step 6: Final answer
   x = 9,849.62