Finding the Fourth Proportional to 8,605.72, 12,905.82 and 2,761

Step by Step Solution

1. Step 1: Write the proportion equation
   8,605.72 : 12,905.82 = 2,761 : x
2. Step 2: Convert to fraction form
   8,605.72/12,905.82 = 2,761/x
3. Step 3: Cross multiply
   8,605.72x = 12,905.82 × 2,761
4. Step 4: Simplify right side
   8,605.72x = 35,632,969.02
5. Step 5: Solve for x
   x = 35,632,969.02/8,605.72
6. Step 6: Final answer
   x = 4,140.61