Finding the Fourth Proportional to 8,585.10, 12,893.49 and 5,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,585.10 : 12,893.49 = 5,143.50 : x
2. Step 2: Convert to fraction form
   8,585.10/12,893.49 = 5,143.50/x
3. Step 3: Cross multiply
   8,585.10x = 12,893.49 × 5,143.50
4. Step 4: Simplify right side
   8,585.10x = 66,317,665.82
5. Step 5: Solve for x
   x = 66,317,665.82/8,585.10
6. Step 6: Final answer
   x = 7,724.74