Finding the Fourth Proportional to 1,520.72, 2,098.78 and 857.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.72 : 2,098.78 = 857.73 : x
2. Step 2: Convert to fraction form
   1,520.72/2,098.78 = 857.73/x
3. Step 3: Cross multiply
   1,520.72x = 2,098.78 × 857.73
4. Step 4: Simplify right side
   1,520.72x = 1,800,186.57
5. Step 5: Solve for x
   x = 1,800,186.57/1,520.72
6. Step 6: Final answer
   x = 1,183.77