Finding the Fourth Proportional to 8,653.48, 12,978.82 and 3,106.68

Step by Step Solution

1. Step 1: Write the proportion equation
   8,653.48 : 12,978.82 = 3,106.68 : x
2. Step 2: Convert to fraction form
   8,653.48/12,978.82 = 3,106.68/x
3. Step 3: Cross multiply
   8,653.48x = 12,978.82 × 3,106.68
4. Step 4: Simplify right side
   8,653.48x = 40,321,040.52
5. Step 5: Solve for x
   x = 40,321,040.52/8,653.48
6. Step 6: Final answer
   x = 4,659.52