Finding the Fourth Proportional to 12,009.36, 17,982.61 and 8,480.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,009.36 : 17,982.61 = 8,480.30 : x
2. Step 2: Convert to fraction form
   12,009.36/17,982.61 = 8,480.30/x
3. Step 3: Cross multiply
   12,009.36x = 17,982.61 × 8,480.30
4. Step 4: Simplify right side
   12,009.36x = 152,497,816.47
5. Step 5: Solve for x
   x = 152,497,816.47/12,009.36
6. Step 6: Final answer
   x = 12,698.24