Finding the Fourth Proportional to 1,321.32, 1,983.15 and 672.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.32 : 1,983.15 = 672.42 : x
2. Step 2: Convert to fraction form
   1,321.32/1,983.15 = 672.42/x
3. Step 3: Cross multiply
   1,321.32x = 1,983.15 × 672.42
4. Step 4: Simplify right side
   1,321.32x = 1,333,509.72
5. Step 5: Solve for x
   x = 1,333,509.72/1,321.32
6. Step 6: Final answer
   x = 1,009.23