Finding the Fourth Proportional to 13,105.94, 18,085.66 and 7,137.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.94 : 18,085.66 = 7,137.60 : x
2. Step 2: Convert to fraction form
   13,105.94/18,085.66 = 7,137.60/x
3. Step 3: Cross multiply
   13,105.94x = 18,085.66 × 7,137.60
4. Step 4: Simplify right side
   13,105.94x = 129,088,206.82
5. Step 5: Solve for x
   x = 129,088,206.82/13,105.94
6. Step 6: Final answer
   x = 9,849.60