Finding the Fourth Proportional to 13,380.31, 18,467.90 and 8,904.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.31 : 18,467.90 = 8,904.25 : x
2. Step 2: Convert to fraction form
   13,380.31/18,467.90 = 8,904.25/x
3. Step 3: Cross multiply
   13,380.31x = 18,467.90 × 8,904.25
4. Step 4: Simplify right side
   13,380.31x = 164,442,798.58
5. Step 5: Solve for x
   x = 164,442,798.58/13,380.31
6. Step 6: Final answer
   x = 12,289.91