Finding the Fourth Proportional to 8,800.78, 12,144.91 and 4,821.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,800.78 : 12,144.91 = 4,821.80 : x
2. Step 2: Convert to fraction form
   8,800.78/12,144.91 = 4,821.80/x
3. Step 3: Cross multiply
   8,800.78x = 12,144.91 × 4,821.80
4. Step 4: Simplify right side
   8,800.78x = 58,560,379.33
5. Step 5: Solve for x
   x = 58,560,379.33/8,800.78
6. Step 6: Final answer
   x = 6,654.00