Finding the Fourth Proportional to 1,379.82, 1,904.28 and 855.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.82 : 1,904.28 = 855.92 : x
2. Step 2: Convert to fraction form
   1,379.82/1,904.28 = 855.92/x
3. Step 3: Cross multiply
   1,379.82x = 1,904.28 × 855.92
4. Step 4: Simplify right side
   1,379.82x = 1,629,911.34
5. Step 5: Solve for x
   x = 1,629,911.34/1,379.82
6. Step 6: Final answer
   x = 1,181.25