Finding the Fourth Proportional to 1,398.03, 1,929.30 and 768.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.03 : 1,929.30 = 768.61 : x
2. Step 2: Convert to fraction form
   1,398.03/1,929.30 = 768.61/x
3. Step 3: Cross multiply
   1,398.03x = 1,929.30 × 768.61
4. Step 4: Simplify right side
   1,398.03x = 1,482,879.27
5. Step 5: Solve for x
   x = 1,482,879.27/1,398.03
6. Step 6: Final answer
   x = 1,060.69