Finding the Fourth Proportional to 1,443.94, 1,992.64 and 780.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.94 : 1,992.64 = 780.79 : x
2. Step 2: Convert to fraction form
   1,443.94/1,992.64 = 780.79/x
3. Step 3: Cross multiply
   1,443.94x = 1,992.64 × 780.79
4. Step 4: Simplify right side
   1,443.94x = 1,555,834.36
5. Step 5: Solve for x
   x = 1,555,834.36/1,443.94
6. Step 6: Final answer
   x = 1,077.49