Finding the Fourth Proportional to 12,608.34, 18,892.98 and 8,661.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,608.34 : 18,892.98 = 8,661.48 : x
2. Step 2: Convert to fraction form
   12,608.34/18,892.98 = 8,661.48/x
3. Step 3: Cross multiply
   12,608.34x = 18,892.98 × 8,661.48
4. Step 4: Simplify right side
   12,608.34x = 163,641,168.41
5. Step 5: Solve for x
   x = 163,641,168.41/12,608.34
6. Step 6: Final answer
   x = 12,978.80