Finding the Fourth Proportional to 3,665.50, 5,498.24 and 2,021.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.50 : 5,498.24 = 2,021.20 : x
2. Step 2: Convert to fraction form
   3,665.50/5,498.24 = 2,021.20/x
3. Step 3: Cross multiply
   3,665.50x = 5,498.24 × 2,021.20
4. Step 4: Simplify right side
   3,665.50x = 11,113,042.69
5. Step 5: Solve for x
   x = 11,113,042.69/3,665.50
6. Step 6: Final answer
   x = 3,031.79