Finding the Fourth Proportional to 1,397.62, 1,928.75 and 768.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.62 : 1,928.75 = 768.21 : x
2. Step 2: Convert to fraction form
   1,397.62/1,928.75 = 768.21/x
3. Step 3: Cross multiply
   1,397.62x = 1,928.75 × 768.21
4. Step 4: Simplify right side
   1,397.62x = 1,481,673.96
5. Step 5: Solve for x
   x = 1,481,673.96/1,397.62
6. Step 6: Final answer
   x = 1,060.14