Finding the Fourth Proportional to 1,398.82, 1,930.40 and 769.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.82 : 1,930.40 = 769.38 : x
2. Step 2: Convert to fraction form
   1,398.82/1,930.40 = 769.38/x
3. Step 3: Cross multiply
   1,398.82x = 1,930.40 × 769.38
4. Step 4: Simplify right side
   1,398.82x = 1,485,200.30
5. Step 5: Solve for x
   x = 1,485,200.30/1,398.82
6. Step 6: Final answer
   x = 1,061.76