Finding the Fourth Proportional to 10,818.31, 16,205.59 and 8,344.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,818.31 : 16,205.59 = 8,344.57 : x
2. Step 2: Convert to fraction form
   10,818.31/16,205.59 = 8,344.57/x
3. Step 3: Cross multiply
   10,818.31x = 16,205.59 × 8,344.57
4. Step 4: Simplify right side
   10,818.31x = 135,228,680.15
5. Step 5: Solve for x
   x = 135,228,680.15/10,818.31
6. Step 6: Final answer
   x = 12,499.98