Finding the Fourth Proportional to 1,398.94, 1,930.55 and 769.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.94 : 1,930.55 = 769.45 : x
2. Step 2: Convert to fraction form
   1,398.94/1,930.55 = 769.45/x
3. Step 3: Cross multiply
   1,398.94x = 1,930.55 × 769.45
4. Step 4: Simplify right side
   1,398.94x = 1,485,453.02
5. Step 5: Solve for x
   x = 1,485,453.02/1,398.94
6. Step 6: Final answer
   x = 1,061.84