Finding the Fourth Proportional to 1,398.75, 1,930.28 and 769.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.75 : 1,930.28 = 769.29 : x
2. Step 2: Convert to fraction form
   1,398.75/1,930.28 = 769.29/x
3. Step 3: Cross multiply
   1,398.75x = 1,930.28 × 769.29
4. Step 4: Simplify right side
   1,398.75x = 1,484,945.10
5. Step 5: Solve for x
   x = 1,484,945.10/1,398.75
6. Step 6: Final answer
   x = 1,061.62