Finding the Fourth Proportional to 389,979.33, 584,969.18 and 140,661.33

Step by Step Solution

1. Step 1: Write the proportion equation
   389,979.33 : 584,969.18 = 140,661.33 : x
2. Step 2: Convert to fraction form
   389,979.33/584,969.18 = 140,661.33/x
3. Step 3: Cross multiply
   389,979.33x = 584,969.18 × 140,661.33
4. Step 4: Simplify right side
   389,979.33x = 82,282,542,164.50
5. Step 5: Solve for x
   x = 82,282,542,164.50/389,979.33
6. Step 6: Final answer
   x = 210,992.06