Finding the Fourth Proportional to 12,086.61, 16,680.53 and 6,709.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.61 : 16,680.53 = 6,709.55 : x
2. Step 2: Convert to fraction form
   12,086.61/16,680.53 = 6,709.55/x
3. Step 3: Cross multiply
   12,086.61x = 16,680.53 × 6,709.55
4. Step 4: Simplify right side
   12,086.61x = 111,918,908.54
5. Step 5: Solve for x
   x = 111,918,908.54/12,086.61
6. Step 6: Final answer
   x = 9,259.74