Finding the Fourth Proportional to 1,521.34, 2,099.49 and 858.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.34 : 2,099.49 = 858.15 : x
2. Step 2: Convert to fraction form
   1,521.34/2,099.49 = 858.15/x
3. Step 3: Cross multiply
   1,521.34x = 2,099.49 × 858.15
4. Step 4: Simplify right side
   1,521.34x = 1,801,674.13
5. Step 5: Solve for x
   x = 1,801,674.13/1,521.34
6. Step 6: Final answer
   x = 1,184.27