Finding the Fourth Proportional to 8,591.87, 12,879.61 and 3,654.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,591.87 : 12,879.61 = 3,654.72 : x
2. Step 2: Convert to fraction form
   8,591.87/12,879.61 = 3,654.72/x
3. Step 3: Cross multiply
   8,591.87x = 12,879.61 × 3,654.72
4. Step 4: Simplify right side
   8,591.87x = 47,071,359.12
5. Step 5: Solve for x
   x = 47,071,359.12/8,591.87
6. Step 6: Final answer
   x = 5,478.59