Finding the Fourth Proportional to 8,059.49, 12,086.16 and 3,128.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,059.49 : 12,086.16 = 3,128.49 : x
2. Step 2: Convert to fraction form
   8,059.49/12,086.16 = 3,128.49/x
3. Step 3: Cross multiply
   8,059.49x = 12,086.16 × 3,128.49
4. Step 4: Simplify right side
   8,059.49x = 37,811,418.97
5. Step 5: Solve for x
   x = 37,811,418.97/8,059.49
6. Step 6: Final answer
   x = 4,691.54