Finding the Fourth Proportional to 13,065.72, 18,019.52 and 8,816.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,065.72 : 18,019.52 = 8,816.05 : x
2. Step 2: Convert to fraction form
   13,065.72/18,019.52 = 8,816.05/x
3. Step 3: Cross multiply
   13,065.72x = 18,019.52 × 8,816.05
4. Step 4: Simplify right side
   13,065.72x = 158,860,945.22
5. Step 5: Solve for x
   x = 158,860,945.22/13,065.72
6. Step 6: Final answer
   x = 12,158.61