Finding the Fourth Proportional to 3,519.30, 5,278.24 and 1,020.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,519.30 : 5,278.24 = 1,020.78 : x
2. Step 2: Convert to fraction form
   3,519.30/5,278.24 = 1,020.78/x
3. Step 3: Cross multiply
   3,519.30x = 5,278.24 × 1,020.78
4. Step 4: Simplify right side
   3,519.30x = 5,387,921.83
5. Step 5: Solve for x
   x = 5,387,921.83/3,519.30
6. Step 6: Final answer
   x = 1,530.96