Finding the Fourth Proportional to 2,859.73, 3,945.18 and 2,020.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.73 : 3,945.18 = 2,020.30 : x
2. Step 2: Convert to fraction form
   2,859.73/3,945.18 = 2,020.30/x
3. Step 3: Cross multiply
   2,859.73x = 3,945.18 × 2,020.30
4. Step 4: Simplify right side
   2,859.73x = 7,970,447.15
5. Step 5: Solve for x
   x = 7,970,447.15/2,859.73
6. Step 6: Final answer
   x = 2,787.13