Finding the Fourth Proportional to 13,356.56, 18,429.72 and 8,319.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,356.56 : 18,429.72 = 8,319.18 : x
2. Step 2: Convert to fraction form
   13,356.56/18,429.72 = 8,319.18/x
3. Step 3: Cross multiply
   13,356.56x = 18,429.72 × 8,319.18
4. Step 4: Simplify right side
   13,356.56x = 153,320,158.03
5. Step 5: Solve for x
   x = 153,320,158.03/13,356.56
6. Step 6: Final answer
   x = 11,479.02