Finding the Fourth Proportional to 1,321.02, 1,982.76 and 672.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.02 : 1,982.76 = 672.24 : x
2. Step 2: Convert to fraction form
   1,321.02/1,982.76 = 672.24/x
3. Step 3: Cross multiply
   1,321.02x = 1,982.76 × 672.24
4. Step 4: Simplify right side
   1,321.02x = 1,332,890.58
5. Step 5: Solve for x
   x = 1,332,890.58/1,321.02
6. Step 6: Final answer
   x = 1,008.99