Finding the Fourth Proportional to 2,133.57, 3,200.40 and 672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,133.57 : 3,200.40 = 672.72 : x
2. Step 2: Convert to fraction form
   2,133.57/3,200.40 = 672.72/x
3. Step 3: Cross multiply
   2,133.57x = 3,200.40 × 672.72
4. Step 4: Simplify right side
   2,133.57x = 2,152,973.09
5. Step 5: Solve for x
   x = 2,152,973.09/2,133.57
6. Step 6: Final answer
   x = 1,009.09