Finding the Fourth Proportional to 1,321.94, 1,983.72 and 672.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.94 : 1,983.72 = 672.32 : x
2. Step 2: Convert to fraction form
   1,321.94/1,983.72 = 672.32/x
3. Step 3: Cross multiply
   1,321.94x = 1,983.72 × 672.32
4. Step 4: Simplify right side
   1,321.94x = 1,333,694.63
5. Step 5: Solve for x
   x = 1,333,694.63/1,321.94
6. Step 6: Final answer
   x = 1,008.89