Finding the Fourth Proportional to 1,521.31, 2,099.49 and 858.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.31 : 2,099.49 = 858.24 : x
2. Step 2: Convert to fraction form
   1,521.31/2,099.49 = 858.24/x
3. Step 3: Cross multiply
   1,521.31x = 2,099.49 × 858.24
4. Step 4: Simplify right side
   1,521.31x = 1,801,866.30
5. Step 5: Solve for x
   x = 1,801,866.30/1,521.31
6. Step 6: Final answer
   x = 1,184.42