Finding the Fourth Proportional to 8,585.59, 12,880.20 and 2,662.87

Step by Step Solution

1. Step 1: Write the proportion equation
   8,585.59 : 12,880.20 = 2,662.87 : x
2. Step 2: Convert to fraction form
   8,585.59/12,880.20 = 2,662.87/x
3. Step 3: Cross multiply
   8,585.59x = 12,880.20 × 2,662.87
4. Step 4: Simplify right side
   8,585.59x = 34,298,298.17
5. Step 5: Solve for x
   x = 34,298,298.17/8,585.59
6. Step 6: Final answer
   x = 3,994.87