Finding the Fourth Proportional to 1,397.61, 1,928.73 and 768.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.61 : 1,928.73 = 768.17 : x
2. Step 2: Convert to fraction form
   1,397.61/1,928.73 = 768.17/x
3. Step 3: Cross multiply
   1,397.61x = 1,928.73 × 768.17
4. Step 4: Simplify right side
   1,397.61x = 1,481,582.88
5. Step 5: Solve for x
   x = 1,481,582.88/1,397.61
6. Step 6: Final answer
   x = 1,060.08