Finding the Fourth Proportional to 8,689.69, 13,032.52 and 5,180.68

Step by Step Solution

1. Step 1: Write the proportion equation
   8,689.69 : 13,032.52 = 5,180.68 : x
2. Step 2: Convert to fraction form
   8,689.69/13,032.52 = 5,180.68/x
3. Step 3: Cross multiply
   8,689.69x = 13,032.52 × 5,180.68
4. Step 4: Simplify right side
   8,689.69x = 67,517,224.65
5. Step 5: Solve for x
   x = 67,517,224.65/8,689.69
6. Step 6: Final answer
   x = 7,769.81