Finding the Fourth Proportional to 8,406.89, 12,606.69 and 2,858.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,406.89 : 12,606.69 = 2,858.75 : x
2. Step 2: Convert to fraction form
   8,406.89/12,606.69 = 2,858.75/x
3. Step 3: Cross multiply
   8,406.89x = 12,606.69 × 2,858.75
4. Step 4: Simplify right side
   8,406.89x = 36,039,297.71
5. Step 5: Solve for x
   x = 36,039,297.71/8,406.89
6. Step 6: Final answer
   x = 4,286.88