Finding the Fourth Proportional to 13,443.84, 18,560.81 and 8,665.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,443.84 : 18,560.81 = 8,665.47 : x
2. Step 2: Convert to fraction form
   13,443.84/18,560.81 = 8,665.47/x
3. Step 3: Cross multiply
   13,443.84x = 18,560.81 × 8,665.47
4. Step 4: Simplify right side
   13,443.84x = 160,838,142.23
5. Step 5: Solve for x
   x = 160,838,142.23/13,443.84
6. Step 6: Final answer
   x = 11,963.71