Finding the Fourth Proportional to 1,442.79, 1,990.90 and 883.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.79 : 1,990.90 = 883.42 : x
2. Step 2: Convert to fraction form
   1,442.79/1,990.90 = 883.42/x
3. Step 3: Cross multiply
   1,442.79x = 1,990.90 × 883.42
4. Step 4: Simplify right side
   1,442.79x = 1,758,793.69
5. Step 5: Solve for x
   x = 1,758,793.69/1,442.79
6. Step 6: Final answer
   x = 1,219.02