Finding the Fourth Proportional to 13,429.56, 18,523.50 and 8,388.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,429.56 : 18,523.50 = 8,388.28 : x
2. Step 2: Convert to fraction form
   13,429.56/18,523.50 = 8,388.28/x
3. Step 3: Cross multiply
   13,429.56x = 18,523.50 × 8,388.28
4. Step 4: Simplify right side
   13,429.56x = 155,380,304.58
5. Step 5: Solve for x
   x = 155,380,304.58/13,429.56
6. Step 6: Final answer
   x = 11,570.02