Finding the Fourth Proportional to 1,586.56, 2,380.55 and 855.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,586.56 : 2,380.55 = 855.29 : x
2. Step 2: Convert to fraction form
   1,586.56/2,380.55 = 855.29/x
3. Step 3: Cross multiply
   1,586.56x = 2,380.55 × 855.29
4. Step 4: Simplify right side
   1,586.56x = 2,036,060.61
5. Step 5: Solve for x
   x = 2,036,060.61/1,586.56
6. Step 6: Final answer
   x = 1,283.32