Finding the Fourth Proportional to 1,399.05, 1,930.57 and 769.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.05 : 1,930.57 = 769.54 : x
2. Step 2: Convert to fraction form
   1,399.05/1,930.57 = 769.54/x
3. Step 3: Cross multiply
   1,399.05x = 1,930.57 × 769.54
4. Step 4: Simplify right side
   1,399.05x = 1,485,646.99
5. Step 5: Solve for x
   x = 1,485,646.99/1,399.05
6. Step 6: Final answer
   x = 1,061.90