Finding the Fourth Proportional to 1,817.67, 2,508.42 and 1,031.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,817.67 : 2,508.42 = 1,031.72 : x
2. Step 2: Convert to fraction form
   1,817.67/2,508.42 = 1,031.72/x
3. Step 3: Cross multiply
   1,817.67x = 2,508.42 × 1,031.72
4. Step 4: Simplify right side
   1,817.67x = 2,587,974.54
5. Step 5: Solve for x
   x = 2,587,974.54/1,817.67
6. Step 6: Final answer
   x = 1,423.79