Finding the Fourth Proportional to 1,340.15, 1,848.84 and 780.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.15 : 1,848.84 = 780.44 : x
2. Step 2: Convert to fraction form
   1,340.15/1,848.84 = 780.44/x
3. Step 3: Cross multiply
   1,340.15x = 1,848.84 × 780.44
4. Step 4: Simplify right side
   1,340.15x = 1,442,908.69
5. Step 5: Solve for x
   x = 1,442,908.69/1,340.15
6. Step 6: Final answer
   x = 1,076.68