Finding the Fourth Proportional to 8,654.05, 13,003.21 and 8,413.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,654.05 : 13,003.21 = 8,413.21 : x
2. Step 2: Convert to fraction form
   8,654.05/13,003.21 = 8,413.21/x
3. Step 3: Cross multiply
   8,654.05x = 13,003.21 × 8,413.21
4. Step 4: Simplify right side
   8,654.05x = 109,398,671.39
5. Step 5: Solve for x
   x = 109,398,671.39/8,654.05
6. Step 6: Final answer
   x = 12,641.33