Finding the Fourth Proportional to 1,817.55, 2,508.18 and 1,020.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,817.55 : 2,508.18 = 1,020.89 : x
2. Step 2: Convert to fraction form
   1,817.55/2,508.18 = 1,020.89/x
3. Step 3: Cross multiply
   1,817.55x = 2,508.18 × 1,020.89
4. Step 4: Simplify right side
   1,817.55x = 2,560,570.78
5. Step 5: Solve for x
   x = 2,560,570.78/1,817.55
6. Step 6: Final answer
   x = 1,408.81