Finding the Fourth Proportional to 1,398.54, 1,929.90 and 768.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.54 : 1,929.90 = 768.94 : x
2. Step 2: Convert to fraction form
   1,398.54/1,929.90 = 768.94/x
3. Step 3: Cross multiply
   1,398.54x = 1,929.90 × 768.94
4. Step 4: Simplify right side
   1,398.54x = 1,483,977.31
5. Step 5: Solve for x
   x = 1,483,977.31/1,398.54
6. Step 6: Final answer
   x = 1,061.09