Finding the Fourth Proportional to 12,309.55, 17,009.39 and 8,766.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.55 : 17,009.39 = 8,766.61 : x
2. Step 2: Convert to fraction form
   12,309.55/17,009.39 = 8,766.61/x
3. Step 3: Cross multiply
   12,309.55x = 17,009.39 × 8,766.61
4. Step 4: Simplify right side
   12,309.55x = 149,114,559.59
5. Step 5: Solve for x
   x = 149,114,559.59/12,309.55
6. Step 6: Final answer
   x = 12,113.73