Finding the Fourth Proportional to 1,342.80, 1,853.01 and 783.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.80 : 1,853.01 = 783.30 : x
2. Step 2: Convert to fraction form
   1,342.80/1,853.01 = 783.30/x
3. Step 3: Cross multiply
   1,342.80x = 1,853.01 × 783.30
4. Step 4: Simplify right side
   1,342.80x = 1,451,462.73
5. Step 5: Solve for x
   x = 1,451,462.73/1,342.80
6. Step 6: Final answer
   x = 1,080.92