Finding the Fourth Proportional to 1,807.80, 2,494.17 and 1,021.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,807.80 : 2,494.17 = 1,021.83 : x
2. Step 2: Convert to fraction form
   1,807.80/2,494.17 = 1,021.83/x
3. Step 3: Cross multiply
   1,807.80x = 2,494.17 × 1,021.83
4. Step 4: Simplify right side
   1,807.80x = 2,548,617.73
5. Step 5: Solve for x
   x = 2,548,617.73/1,807.80
6. Step 6: Final answer
   x = 1,409.79