Finding the Fourth Proportional to 1,292.67, 1,783.89 and 768.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,292.67 : 1,783.89 = 768.71 : x
2. Step 2: Convert to fraction form
   1,292.67/1,783.89 = 768.71/x
3. Step 3: Cross multiply
   1,292.67x = 1,783.89 × 768.71
4. Step 4: Simplify right side
   1,292.67x = 1,371,285.16
5. Step 5: Solve for x
   x = 1,371,285.16/1,292.67
6. Step 6: Final answer
   x = 1,060.82