Finding the Fourth Proportional to 14,388.86, 19,856.57 and 8,419.37

Step by Step Solution

1. Step 1: Write the proportion equation
   14,388.86 : 19,856.57 = 8,419.37 : x
2. Step 2: Convert to fraction form
   14,388.86/19,856.57 = 8,419.37/x
3. Step 3: Cross multiply
   14,388.86x = 19,856.57 × 8,419.37
4. Step 4: Simplify right side
   14,388.86x = 167,179,668.38
5. Step 5: Solve for x
   x = 167,179,668.38/14,388.86
6. Step 6: Final answer
   x = 11,618.69