Finding the Fourth Proportional to 1,442.49, 1,990.67 and 852.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.49 : 1,990.67 = 852.81 : x
2. Step 2: Convert to fraction form
   1,442.49/1,990.67 = 852.81/x
3. Step 3: Cross multiply
   1,442.49x = 1,990.67 × 852.81
4. Step 4: Simplify right side
   1,442.49x = 1,697,663.28
5. Step 5: Solve for x
   x = 1,697,663.28/1,442.49
6. Step 6: Final answer
   x = 1,176.90