Finding the Fourth Proportional to 13,105.60, 18,085.82 and 7,137.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.60 : 18,085.82 = 7,137.26 : x
2. Step 2: Convert to fraction form
   13,105.60/18,085.82 = 7,137.26/x
3. Step 3: Cross multiply
   13,105.60x = 18,085.82 × 7,137.26
4. Step 4: Simplify right side
   13,105.60x = 129,083,199.65
5. Step 5: Solve for x
   x = 129,083,199.65/13,105.60
6. Step 6: Final answer
   x = 9,849.47