Finding the Fourth Proportional to 1,520.88, 2,098.88 and 857.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.88 : 2,098.88 = 857.76 : x
2. Step 2: Convert to fraction form
   1,520.88/2,098.88 = 857.76/x
3. Step 3: Cross multiply
   1,520.88x = 2,098.88 × 857.76
4. Step 4: Simplify right side
   1,520.88x = 1,800,335.31
5. Step 5: Solve for x
   x = 1,800,335.31/1,520.88
6. Step 6: Final answer
   x = 1,183.75