Finding the Fourth Proportional to 3,982.09, 5,973.31 and 1,209.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,982.09 : 5,973.31 = 1,209.15 : x
2. Step 2: Convert to fraction form
   3,982.09/5,973.31 = 1,209.15/x
3. Step 3: Cross multiply
   3,982.09x = 5,973.31 × 1,209.15
4. Step 4: Simplify right side
   3,982.09x = 7,222,627.79
5. Step 5: Solve for x
   x = 7,222,627.79/3,982.09
6. Step 6: Final answer
   x = 1,813.78