Finding the Fourth Proportional to 8,389.91, 12,586.38 and 3,456.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,389.91 : 12,586.38 = 3,456.86 : x
2. Step 2: Convert to fraction form
   8,389.91/12,586.38 = 3,456.86/x
3. Step 3: Cross multiply
   8,389.91x = 12,586.38 × 3,456.86
4. Step 4: Simplify right side
   8,389.91x = 43,509,290.63
5. Step 5: Solve for x
   x = 43,509,290.63/8,389.91
6. Step 6: Final answer
   x = 5,185.91