Finding the Fourth Proportional to 3,485.28, 5,228.61 and 1,020.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,485.28 : 5,228.61 = 1,020.15 : x
2. Step 2: Convert to fraction form
   3,485.28/5,228.61 = 1,020.15/x
3. Step 3: Cross multiply
   3,485.28x = 5,228.61 × 1,020.15
4. Step 4: Simplify right side
   3,485.28x = 5,333,966.49
5. Step 5: Solve for x
   x = 5,333,966.49/3,485.28
6. Step 6: Final answer
   x = 1,530.43