Finding the Fourth Proportional to 1,338.50, 2,008.83 and 689.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.50 : 2,008.83 = 689.42 : x
2. Step 2: Convert to fraction form
   1,338.50/2,008.83 = 689.42/x
3. Step 3: Cross multiply
   1,338.50x = 2,008.83 × 689.42
4. Step 4: Simplify right side
   1,338.50x = 1,384,927.58
5. Step 5: Solve for x
   x = 1,384,927.58/1,338.50
6. Step 6: Final answer
   x = 1,034.69