Finding the Fourth Proportional to 2,837.80, 4,259.10 and 1,280.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,837.80 : 4,259.10 = 1,280.20 : x
2. Step 2: Convert to fraction form
   2,837.80/4,259.10 = 1,280.20/x
3. Step 3: Cross multiply
   2,837.80x = 4,259.10 × 1,280.20
4. Step 4: Simplify right side
   2,837.80x = 5,452,499.82
5. Step 5: Solve for x
   x = 5,452,499.82/2,837.80
6. Step 6: Final answer
   x = 1,921.38