Finding the Fourth Proportional to 3,128.83, 4,693.15 and 1,020.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.83 : 4,693.15 = 1,020.45 : x
2. Step 2: Convert to fraction form
   3,128.83/4,693.15 = 1,020.45/x
3. Step 3: Cross multiply
   3,128.83x = 4,693.15 × 1,020.45
4. Step 4: Simplify right side
   3,128.83x = 4,789,124.92
5. Step 5: Solve for x
   x = 4,789,124.92/3,128.83
6. Step 6: Final answer
   x = 1,530.64