Finding the Fourth Proportional to 1,442.73, 1,990.24 and 853.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.73 : 1,990.24 = 853.05 : x
2. Step 2: Convert to fraction form
   1,442.73/1,990.24 = 853.05/x
3. Step 3: Cross multiply
   1,442.73x = 1,990.24 × 853.05
4. Step 4: Simplify right side
   1,442.73x = 1,697,772.10
5. Step 5: Solve for x
   x = 1,697,772.10/1,442.73
6. Step 6: Final answer
   x = 1,176.78