Finding the Fourth Proportional to 1,520.71, 2,098.55 and 857.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.71 : 2,098.55 = 857.55 : x
2. Step 2: Convert to fraction form
   1,520.71/2,098.55 = 857.55/x
3. Step 3: Cross multiply
   1,520.71x = 2,098.55 × 857.55
4. Step 4: Simplify right side
   1,520.71x = 1,799,613.70
5. Step 5: Solve for x
   x = 1,799,613.70/1,520.71
6. Step 6: Final answer
   x = 1,183.41