Finding the Fourth Proportional to 8,641.84, 12,949.55 and 5,820.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,641.84 : 12,949.55 = 5,820.24 : x
2. Step 2: Convert to fraction form
   8,641.84/12,949.55 = 5,820.24/x
3. Step 3: Cross multiply
   8,641.84x = 12,949.55 × 5,820.24
4. Step 4: Simplify right side
   8,641.84x = 75,369,456.52
5. Step 5: Solve for x
   x = 75,369,456.52/8,641.84
6. Step 6: Final answer
   x = 8,721.46