Finding the Fourth Proportional to 8,139.24, 12,201.66 and 3,519.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.24 : 12,201.66 = 3,519.72 : x
2. Step 2: Convert to fraction form
   8,139.24/12,201.66 = 3,519.72/x
3. Step 3: Cross multiply
   8,139.24x = 12,201.66 × 3,519.72
4. Step 4: Simplify right side
   8,139.24x = 42,946,426.74
5. Step 5: Solve for x
   x = 42,946,426.74/8,139.24
6. Step 6: Final answer
   x = 5,276.47