Finding the Fourth Proportional to 1,338.37, 1,846.97 and 778.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.37 : 1,846.97 = 778.79 : x
2. Step 2: Convert to fraction form
   1,338.37/1,846.97 = 778.79/x
3. Step 3: Cross multiply
   1,338.37x = 1,846.97 × 778.79
4. Step 4: Simplify right side
   1,338.37x = 1,438,401.77
5. Step 5: Solve for x
   x = 1,438,401.77/1,338.37
6. Step 6: Final answer
   x = 1,074.74