Finding the Fourth Proportional to 8,800.78, 13,109.47 and 8,333.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,800.78 : 13,109.47 = 8,333.30 : x
2. Step 2: Convert to fraction form
   8,800.78/13,109.47 = 8,333.30/x
3. Step 3: Cross multiply
   8,800.78x = 13,109.47 × 8,333.30
4. Step 4: Simplify right side
   8,800.78x = 109,245,146.35
5. Step 5: Solve for x
   x = 109,245,146.35/8,800.78
6. Step 6: Final answer
   x = 12,413.13