Finding the Fourth Proportional to 8,659.49, 12,978.98 and 3,975.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,659.49 : 12,978.98 = 3,975.56 : x
2. Step 2: Convert to fraction form
   8,659.49/12,978.98 = 3,975.56/x
3. Step 3: Cross multiply
   8,659.49x = 12,978.98 × 3,975.56
4. Step 4: Simplify right side
   8,659.49x = 51,598,713.73
5. Step 5: Solve for x
   x = 51,598,713.73/8,659.49
6. Step 6: Final answer
   x = 5,958.63