Finding the Fourth Proportional to 13,265.83, 18,308.61 and 8,563.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,265.83 : 18,308.61 = 8,563.78 : x
2. Step 2: Convert to fraction form
   13,265.83/18,308.61 = 8,563.78/x
3. Step 3: Cross multiply
   13,265.83x = 18,308.61 × 8,563.78
4. Step 4: Simplify right side
   13,265.83x = 156,790,908.15
5. Step 5: Solve for x
   x = 156,790,908.15/13,265.83
6. Step 6: Final answer
   x = 11,819.16