Finding the Fourth Proportional to 13,315.52, 18,369.72 and 8,007.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,315.52 : 18,369.72 = 8,007.20 : x
2. Step 2: Convert to fraction form
   13,315.52/18,369.72 = 8,007.20/x
3. Step 3: Cross multiply
   13,315.52x = 18,369.72 × 8,007.20
4. Step 4: Simplify right side
   13,315.52x = 147,090,021.98
5. Step 5: Solve for x
   x = 147,090,021.98/13,315.52
6. Step 6: Final answer
   x = 11,046.51