Finding the Fourth Proportional to 1,340.43, 1,849.33 and 780.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.43 : 1,849.33 = 780.61 : x
2. Step 2: Convert to fraction form
   1,340.43/1,849.33 = 780.61/x
3. Step 3: Cross multiply
   1,340.43x = 1,849.33 × 780.61
4. Step 4: Simplify right side
   1,340.43x = 1,443,605.49
5. Step 5: Solve for x
   x = 1,443,605.49/1,340.43
6. Step 6: Final answer
   x = 1,076.97