Finding the Fourth Proportional to 2,139.72, 3,205.80 and 983.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.72 : 3,205.80 = 983.04 : x
2. Step 2: Convert to fraction form
   2,139.72/3,205.80 = 983.04/x
3. Step 3: Cross multiply
   2,139.72x = 3,205.80 × 983.04
4. Step 4: Simplify right side
   2,139.72x = 3,151,429.63
5. Step 5: Solve for x
   x = 3,151,429.63/2,139.72
6. Step 6: Final answer
   x = 1,472.82