Finding the Fourth Proportional to 1,521.17, 2,099.24 and 857.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.17 : 2,099.24 = 857.89 : x
2. Step 2: Convert to fraction form
   1,521.17/2,099.24 = 857.89/x
3. Step 3: Cross multiply
   1,521.17x = 2,099.24 × 857.89
4. Step 4: Simplify right side
   1,521.17x = 1,800,924.40
5. Step 5: Solve for x
   x = 1,800,924.40/1,521.17
6. Step 6: Final answer
   x = 1,183.91