Finding the Fourth Proportional to 1,336.20, 1,843.56 and 768.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.20 : 1,843.56 = 768.87 : x
2. Step 2: Convert to fraction form
   1,336.20/1,843.56 = 768.87/x
3. Step 3: Cross multiply
   1,336.20x = 1,843.56 × 768.87
4. Step 4: Simplify right side
   1,336.20x = 1,417,452.79
5. Step 5: Solve for x
   x = 1,417,452.79/1,336.20
6. Step 6: Final answer
   x = 1,060.81