Finding the Fourth Proportional to 8,578.51, 12,856.83 and 4,620.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,578.51 : 12,856.83 = 4,620.49 : x
2. Step 2: Convert to fraction form
   8,578.51/12,856.83 = 4,620.49/x
3. Step 3: Cross multiply
   8,578.51x = 12,856.83 × 4,620.49
4. Step 4: Simplify right side
   8,578.51x = 59,404,877.30
5. Step 5: Solve for x
   x = 59,404,877.30/8,578.51
6. Step 6: Final answer
   x = 6,924.85