Finding the Fourth Proportional to 1,485.29, 2,049.80 and 855.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.29 : 2,049.80 = 855.99 : x
2. Step 2: Convert to fraction form
   1,485.29/2,049.80 = 855.99/x
3. Step 3: Cross multiply
   1,485.29x = 2,049.80 × 855.99
4. Step 4: Simplify right side
   1,485.29x = 1,754,608.30
5. Step 5: Solve for x
   x = 1,754,608.30/1,485.29
6. Step 6: Final answer
   x = 1,181.32