Finding the Fourth Proportional to 1,520.79, 2,098.78 and 857.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.79 : 2,098.78 = 857.52 : x
2. Step 2: Convert to fraction form
   1,520.79/2,098.78 = 857.52/x
3. Step 3: Cross multiply
   1,520.79x = 2,098.78 × 857.52
4. Step 4: Simplify right side
   1,520.79x = 1,799,743.68
5. Step 5: Solve for x
   x = 1,799,743.68/1,520.79
6. Step 6: Final answer
   x = 1,183.43