Finding the Fourth Proportional to 8,128.24, 12,185.88 and 3,508

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.24 : 12,185.88 = 3,508 : x
2. Step 2: Convert to fraction form
   8,128.24/12,185.88 = 3,508/x
3. Step 3: Cross multiply
   8,128.24x = 12,185.88 × 3,508
4. Step 4: Simplify right side
   8,128.24x = 42,748,067.04
5. Step 5: Solve for x
   x = 42,748,067.04/8,128.24
6. Step 6: Final answer
   x = 5,259.20