Finding the Fourth Proportional to 8,819.61, 12,166.72 and 6,425.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,819.61 : 12,166.72 = 6,425.86 : x
2. Step 2: Convert to fraction form
   8,819.61/12,166.72 = 6,425.86/x
3. Step 3: Cross multiply
   8,819.61x = 12,166.72 × 6,425.86
4. Step 4: Simplify right side
   8,819.61x = 78,181,578.55
5. Step 5: Solve for x
   x = 78,181,578.55/8,819.61
6. Step 6: Final answer
   x = 8,864.52