Finding the Fourth Proportional to 1,520.79, 2,098.73 and 857.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.79 : 2,098.73 = 857.67 : x
2. Step 2: Convert to fraction form
   1,520.79/2,098.73 = 857.67/x
3. Step 3: Cross multiply
   1,520.79x = 2,098.73 × 857.67
4. Step 4: Simplify right side
   1,520.79x = 1,800,017.76
5. Step 5: Solve for x
   x = 1,800,017.76/1,520.79
6. Step 6: Final answer
   x = 1,183.61