Finding the Fourth Proportional to 1,339.82, 1,849.13 and 780.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.82 : 1,849.13 = 780.46 : x
2. Step 2: Convert to fraction form
   1,339.82/1,849.13 = 780.46/x
3. Step 3: Cross multiply
   1,339.82x = 1,849.13 × 780.46
4. Step 4: Simplify right side
   1,339.82x = 1,443,178.80
5. Step 5: Solve for x
   x = 1,443,178.80/1,339.82
6. Step 6: Final answer
   x = 1,077.15