Finding the Fourth Proportional to 1,442.16, 1,990.17 and 804.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.16 : 1,990.17 = 804.09 : x
2. Step 2: Convert to fraction form
   1,442.16/1,990.17 = 804.09/x
3. Step 3: Cross multiply
   1,442.16x = 1,990.17 × 804.09
4. Step 4: Simplify right side
   1,442.16x = 1,600,275.80
5. Step 5: Solve for x
   x = 1,600,275.80/1,442.16
6. Step 6: Final answer
   x = 1,109.64