Finding the Fourth Proportional to 14,128.24, 19,500.78 and 8,819.86

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.24 : 19,500.78 = 8,819.86 : x
2. Step 2: Convert to fraction form
   14,128.24/19,500.78 = 8,819.86/x
3. Step 3: Cross multiply
   14,128.24x = 19,500.78 × 8,819.86
4. Step 4: Simplify right side
   14,128.24x = 171,994,149.49
5. Step 5: Solve for x
   x = 171,994,149.49/14,128.24
6. Step 6: Final answer
   x = 12,173.78