Finding the Fourth Proportional to 13,908.47, 20,865.32 and 5,589.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,908.47 : 20,865.32 = 5,589.15 : x
2. Step 2: Convert to fraction form
   13,908.47/20,865.32 = 5,589.15/x
3. Step 3: Cross multiply
   13,908.47x = 20,865.32 × 5,589.15
4. Step 4: Simplify right side
   13,908.47x = 116,619,375.33
5. Step 5: Solve for x
   x = 116,619,375.33/13,908.47
6. Step 6: Final answer
   x = 8,384.78