Finding the Fourth Proportional to 2,139.57, 3,206.88 and 982.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.57 : 3,206.88 = 982.89 : x
2. Step 2: Convert to fraction form
   2,139.57/3,206.88 = 982.89/x
3. Step 3: Cross multiply
   2,139.57x = 3,206.88 × 982.89
4. Step 4: Simplify right side
   2,139.57x = 3,152,010.28
5. Step 5: Solve for x
   x = 3,152,010.28/2,139.57
6. Step 6: Final answer
   x = 1,473.20