Finding the Fourth Proportional to 2,280.80, 3,147.31 and 1,397.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.80 : 3,147.31 = 1,397.09 : x
2. Step 2: Convert to fraction form
   2,280.80/3,147.31 = 1,397.09/x
3. Step 3: Cross multiply
   2,280.80x = 3,147.31 × 1,397.09
4. Step 4: Simplify right side
   2,280.80x = 4,397,075.33
5. Step 5: Solve for x
   x = 4,397,075.33/2,280.80
6. Step 6: Final answer
   x = 1,927.87