Finding the Fourth Proportional to 13,109.48, 18,078.50 and 8,861.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.48 : 18,078.50 = 8,861.16 : x
2. Step 2: Convert to fraction form
   13,109.48/18,078.50 = 8,861.16/x
3. Step 3: Cross multiply
   13,109.48x = 18,078.50 × 8,861.16
4. Step 4: Simplify right side
   13,109.48x = 160,196,481.06
5. Step 5: Solve for x
   x = 160,196,481.06/13,109.48
6. Step 6: Final answer
   x = 12,219.90