Finding the Fourth Proportional to 13,380.60, 18,459.30 and 9,404.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.60 : 18,459.30 = 9,404.31 : x
2. Step 2: Convert to fraction form
   13,380.60/18,459.30 = 9,404.31/x
3. Step 3: Cross multiply
   13,380.60x = 18,459.30 × 9,404.31
4. Step 4: Simplify right side
   13,380.60x = 173,596,979.58
5. Step 5: Solve for x
   x = 173,596,979.58/13,380.60
6. Step 6: Final answer
   x = 12,973.78