Finding the Fourth Proportional to 1,339.84, 1,848.81 and 780.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.84 : 1,848.81 = 780.49 : x
2. Step 2: Convert to fraction form
   1,339.84/1,848.81 = 780.49/x
3. Step 3: Cross multiply
   1,339.84x = 1,848.81 × 780.49
4. Step 4: Simplify right side
   1,339.84x = 1,442,977.72
5. Step 5: Solve for x
   x = 1,442,977.72/1,339.84
6. Step 6: Final answer
   x = 1,076.98