Finding the Fourth Proportional to 8,656.56, 12,985.47 and 3,109.95

Step by Step Solution

1. Step 1: Write the proportion equation
   8,656.56 : 12,985.47 = 3,109.95 : x
2. Step 2: Convert to fraction form
   8,656.56/12,985.47 = 3,109.95/x
3. Step 3: Cross multiply
   8,656.56x = 12,985.47 × 3,109.95
4. Step 4: Simplify right side
   8,656.56x = 40,384,162.43
5. Step 5: Solve for x
   x = 40,384,162.43/8,656.56
6. Step 6: Final answer
   x = 4,665.15