Finding the Fourth Proportional to 1,382.79, 1,908.20 and 768.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.79 : 1,908.20 = 768.85 : x
2. Step 2: Convert to fraction form
   1,382.79/1,908.20 = 768.85/x
3. Step 3: Cross multiply
   1,382.79x = 1,908.20 × 768.85
4. Step 4: Simplify right side
   1,382.79x = 1,467,116.72
5. Step 5: Solve for x
   x = 1,467,116.72/1,382.79
6. Step 6: Final answer
   x = 1,060.98