Finding the Fourth Proportional to 1,521.36, 2,099.57 and 858.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.36 : 2,099.57 = 858.42 : x
2. Step 2: Convert to fraction form
   1,521.36/2,099.57 = 858.42/x
3. Step 3: Cross multiply
   1,521.36x = 2,099.57 × 858.42
4. Step 4: Simplify right side
   1,521.36x = 1,802,308.59
5. Step 5: Solve for x
   x = 1,802,308.59/1,521.36
6. Step 6: Final answer
   x = 1,184.67