Finding the Fourth Proportional to 1,061.92, 1,590.04 and 855.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.92 : 1,590.04 = 855.37 : x
2. Step 2: Convert to fraction form
   1,061.92/1,590.04 = 855.37/x
3. Step 3: Cross multiply
   1,061.92x = 1,590.04 × 855.37
4. Step 4: Simplify right side
   1,061.92x = 1,360,060.29
5. Step 5: Solve for x
   x = 1,360,060.29/1,061.92
6. Step 6: Final answer
   x = 1,280.76