Finding the Fourth Proportional to 3,485.89, 5,229.31 and 1,020.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,485.89 : 5,229.31 = 1,020.35 : x
2. Step 2: Convert to fraction form
   3,485.89/5,229.31 = 1,020.35/x
3. Step 3: Cross multiply
   3,485.89x = 5,229.31 × 1,020.35
4. Step 4: Simplify right side
   3,485.89x = 5,335,709.48
5. Step 5: Solve for x
   x = 5,335,709.48/3,485.89
6. Step 6: Final answer
   x = 1,530.66