Finding the Fourth Proportional to 13,380.43, 19,989.26 and 8,662.00

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.43 : 19,989.26 = 8,662.00 : x
2. Step 2: Convert to fraction form
   13,380.43/19,989.26 = 8,662.00/x
3. Step 3: Cross multiply
   13,380.43x = 19,989.26 × 8,662.00
4. Step 4: Simplify right side
   13,380.43x = 173,146,826.86
5. Step 5: Solve for x
   x = 173,146,826.86/13,380.43
6. Step 6: Final answer
   x = 12,940.31