Finding the Fourth Proportional to 2,152.81, 3,229.29 and 672.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.81 : 3,229.29 = 672.18 : x
2. Step 2: Convert to fraction form
   2,152.81/3,229.29 = 672.18/x
3. Step 3: Cross multiply
   2,152.81x = 3,229.29 × 672.18
4. Step 4: Simplify right side
   2,152.81x = 2,170,664.15
5. Step 5: Solve for x
   x = 2,170,664.15/2,152.81
6. Step 6: Final answer
   x = 1,008.29