Finding the Fourth Proportional to 8,605.56, 12,905.52 and 2,760.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,605.56 : 12,905.52 = 2,760.78 : x
2. Step 2: Convert to fraction form
   8,605.56/12,905.52 = 2,760.78/x
3. Step 3: Cross multiply
   8,605.56x = 12,905.52 × 2,760.78
4. Step 4: Simplify right side
   8,605.56x = 35,629,301.51
5. Step 5: Solve for x
   x = 35,629,301.51/8,605.56
6. Step 6: Final answer
   x = 4,140.27