Finding the Fourth Proportional to 1,404.31, 2,103.73 and 855.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.31 : 2,103.73 = 855.13 : x
2. Step 2: Convert to fraction form
   1,404.31/2,103.73 = 855.13/x
3. Step 3: Cross multiply
   1,404.31x = 2,103.73 × 855.13
4. Step 4: Simplify right side
   1,404.31x = 1,798,959.18
5. Step 5: Solve for x
   x = 1,798,959.18/1,404.31
6. Step 6: Final answer
   x = 1,281.03