Finding the Fourth Proportional to 13,426.21, 18,513.52 and 8,388.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,426.21 : 18,513.52 = 8,388.69 : x
2. Step 2: Convert to fraction form
   13,426.21/18,513.52 = 8,388.69/x
3. Step 3: Cross multiply
   13,426.21x = 18,513.52 × 8,388.69
4. Step 4: Simplify right side
   13,426.21x = 155,304,180.09
5. Step 5: Solve for x
   x = 155,304,180.09/13,426.21
6. Step 6: Final answer
   x = 11,567.24