Finding the Fourth Proportional to 8,585.38, 12,860.38 and 4,129.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,585.38 : 12,860.38 = 4,129.89 : x
2. Step 2: Convert to fraction form
   8,585.38/12,860.38 = 4,129.89/x
3. Step 3: Cross multiply
   8,585.38x = 12,860.38 × 4,129.89
4. Step 4: Simplify right side
   8,585.38x = 53,111,911.69
5. Step 5: Solve for x
   x = 53,111,911.69/8,585.38
6. Step 6: Final answer
   x = 6,186.32