Finding the Fourth Proportional to 1,397.51, 1,928.56 and 768.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.51 : 1,928.56 = 768.05 : x
2. Step 2: Convert to fraction form
   1,397.51/1,928.56 = 768.05/x
3. Step 3: Cross multiply
   1,397.51x = 1,928.56 × 768.05
4. Step 4: Simplify right side
   1,397.51x = 1,481,226.67
5. Step 5: Solve for x
   x = 1,481,226.67/1,397.51
6. Step 6: Final answer
   x = 1,059.91