Finding the Fourth Proportional to 10,589.22, 15,858.72 and 8,390.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,589.22 : 15,858.72 = 8,390.88 : x
2. Step 2: Convert to fraction form
   10,589.22/15,858.72 = 8,390.88/x
3. Step 3: Cross multiply
   10,589.22x = 15,858.72 × 8,390.88
4. Step 4: Simplify right side
   10,589.22x = 133,068,616.47
5. Step 5: Solve for x
   x = 133,068,616.47/10,589.22
6. Step 6: Final answer
   x = 12,566.42