Finding the Fourth Proportional to 1,520.76, 2,098.60 and 857.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.76 : 2,098.60 = 857.61 : x
2. Step 2: Convert to fraction form
   1,520.76/2,098.60 = 857.61/x
3. Step 3: Cross multiply
   1,520.76x = 2,098.60 × 857.61
4. Step 4: Simplify right side
   1,520.76x = 1,799,769.85
5. Step 5: Solve for x
   x = 1,799,769.85/1,520.76
6. Step 6: Final answer
   x = 1,183.47