Finding the Fourth Proportional to 12,578.92, 18,871.29 and 3,693.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.92 : 18,871.29 = 3,693.89 : x
2. Step 2: Convert to fraction form
   12,578.92/18,871.29 = 3,693.89/x
3. Step 3: Cross multiply
   12,578.92x = 18,871.29 × 3,693.89
4. Step 4: Simplify right side
   12,578.92x = 69,708,469.42
5. Step 5: Solve for x
   x = 69,708,469.42/12,578.92
6. Step 6: Final answer
   x = 5,541.69