Finding the Fourth Proportional to 14,078.89, 19,428.69 and 8,489.89

Step by Step Solution

1. Step 1: Write the proportion equation
   14,078.89 : 19,428.69 = 8,489.89 : x
2. Step 2: Convert to fraction form
   14,078.89/19,428.69 = 8,489.89/x
3. Step 3: Cross multiply
   14,078.89x = 19,428.69 × 8,489.89
4. Step 4: Simplify right side
   14,078.89x = 164,947,440.94
5. Step 5: Solve for x
   x = 164,947,440.94/14,078.89
6. Step 6: Final answer
   x = 11,715.94