Finding the Fourth Proportional to 2,139.16, 3,209.31 and 984.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.16 : 3,209.31 = 984.64 : x
2. Step 2: Convert to fraction form
   2,139.16/3,209.31 = 984.64/x
3. Step 3: Cross multiply
   2,139.16x = 3,209.31 × 984.64
4. Step 4: Simplify right side
   2,139.16x = 3,160,015.00
5. Step 5: Solve for x
   x = 3,160,015.00/2,139.16
6. Step 6: Final answer
   x = 1,477.22