Finding the Fourth Proportional to 1,441.98, 1,989.93 and 778.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.98 : 1,989.93 = 778.83 : x
2. Step 2: Convert to fraction form
   1,441.98/1,989.93 = 778.83/x
3. Step 3: Cross multiply
   1,441.98x = 1,989.93 × 778.83
4. Step 4: Simplify right side
   1,441.98x = 1,549,815.45
5. Step 5: Solve for x
   x = 1,549,815.45/1,441.98
6. Step 6: Final answer
   x = 1,074.78