Finding the Fourth Proportional to 1,636.39, 2,449.18 and 1,020.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.39 : 2,449.18 = 1,020.55 : x
2. Step 2: Convert to fraction form
   1,636.39/2,449.18 = 1,020.55/x
3. Step 3: Cross multiply
   1,636.39x = 2,449.18 × 1,020.55
4. Step 4: Simplify right side
   1,636.39x = 2,499,510.65
5. Step 5: Solve for x
   x = 2,499,510.65/1,636.39
6. Step 6: Final answer
   x = 1,527.45