Finding the Fourth Proportional to 8,663.78, 12,907.05 and 8,245.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,663.78 : 12,907.05 = 8,245.82 : x
2. Step 2: Convert to fraction form
   8,663.78/12,907.05 = 8,245.82/x
3. Step 3: Cross multiply
   8,663.78x = 12,907.05 × 8,245.82
4. Step 4: Simplify right side
   8,663.78x = 106,429,169.80
5. Step 5: Solve for x
   x = 106,429,169.80/8,663.78
6. Step 6: Final answer
   x = 12,284.38