Finding the Fourth Proportional to 8,128.74, 12,185.16 and 3,968.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.74 : 12,185.16 = 3,968.58 : x
2. Step 2: Convert to fraction form
   8,128.74/12,185.16 = 3,968.58/x
3. Step 3: Cross multiply
   8,128.74x = 12,185.16 × 3,968.58
4. Step 4: Simplify right side
   8,128.74x = 48,357,782.27
5. Step 5: Solve for x
   x = 48,357,782.27/8,128.74
6. Step 6: Final answer
   x = 5,948.99