Finding the Fourth Proportional to 13,145.94, 18,140.69 and 7,696.67

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.94 : 18,140.69 = 7,696.67 : x
2. Step 2: Convert to fraction form
   13,145.94/18,140.69 = 7,696.67/x
3. Step 3: Cross multiply
   13,145.94x = 18,140.69 × 7,696.67
4. Step 4: Simplify right side
   13,145.94x = 139,622,833.04
5. Step 5: Solve for x
   x = 139,622,833.04/13,145.94
6. Step 6: Final answer
   x = 10,620.99