Finding the Fourth Proportional to 1,443.82, 1,992.47 and 780.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.82 : 1,992.47 = 780.67 : x
2. Step 2: Convert to fraction form
   1,443.82/1,992.47 = 780.67/x
3. Step 3: Cross multiply
   1,443.82x = 1,992.47 × 780.67
4. Step 4: Simplify right side
   1,443.82x = 1,555,447.69
5. Step 5: Solve for x
   x = 1,555,447.69/1,443.82
6. Step 6: Final answer
   x = 1,077.31