Finding the Fourth Proportional to 8,589.30, 12,878.69 and 3,656.13

Step by Step Solution

1. Step 1: Write the proportion equation
   8,589.30 : 12,878.69 = 3,656.13 : x
2. Step 2: Convert to fraction form
   8,589.30/12,878.69 = 3,656.13/x
3. Step 3: Cross multiply
   8,589.30x = 12,878.69 × 3,656.13
4. Step 4: Simplify right side
   8,589.30x = 47,086,146.59
5. Step 5: Solve for x
   x = 47,086,146.59/8,589.30
6. Step 6: Final answer
   x = 5,481.95