Finding the Fourth Proportional to 12,856.61, 19,144.41 and 12,383.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.61 : 19,144.41 = 12,383.67 : x
2. Step 2: Convert to fraction form
   12,856.61/19,144.41 = 12,383.67/x
3. Step 3: Cross multiply
   12,856.61x = 19,144.41 × 12,383.67
4. Step 4: Simplify right side
   12,856.61x = 237,078,055.78
5. Step 5: Solve for x
   x = 237,078,055.78/12,856.61
6. Step 6: Final answer
   x = 18,440.18