Finding the Fourth Proportional to 8,994.47, 12,413.97 and 5,640.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,994.47 : 12,413.97 = 5,640.15 : x
2. Step 2: Convert to fraction form
   8,994.47/12,413.97 = 5,640.15/x
3. Step 3: Cross multiply
   8,994.47x = 12,413.97 × 5,640.15
4. Step 4: Simplify right side
   8,994.47x = 70,016,652.90
5. Step 5: Solve for x
   x = 70,016,652.90/8,994.47
6. Step 6: Final answer
   x = 7,784.42