Finding the Fourth Proportional to 8,589.18, 12,872.34 and 5,623.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,589.18 : 12,872.34 = 5,623.86 : x
2. Step 2: Convert to fraction form
   8,589.18/12,872.34 = 5,623.86/x
3. Step 3: Cross multiply
   8,589.18x = 12,872.34 × 5,623.86
4. Step 4: Simplify right side
   8,589.18x = 72,392,238.03
5. Step 5: Solve for x
   x = 72,392,238.03/8,589.18
6. Step 6: Final answer
   x = 8,428.31