Finding the Fourth Proportional to 1,382.62, 1,908.21 and 858.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.62 : 1,908.21 = 858.82 : x
2. Step 2: Convert to fraction form
   1,382.62/1,908.21 = 858.82/x
3. Step 3: Cross multiply
   1,382.62x = 1,908.21 × 858.82
4. Step 4: Simplify right side
   1,382.62x = 1,638,808.91
5. Step 5: Solve for x
   x = 1,638,808.91/1,382.62
6. Step 6: Final answer
   x = 1,185.29