Finding the Fourth Proportional to 2,200.32, 3,300.69 and 640.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,200.32 : 3,300.69 = 640.33 : x
2. Step 2: Convert to fraction form
   2,200.32/3,300.69 = 640.33/x
3. Step 3: Cross multiply
   2,200.32x = 3,300.69 × 640.33
4. Step 4: Simplify right side
   2,200.32x = 2,113,527.63
5. Step 5: Solve for x
   x = 2,113,527.63/2,200.32
6. Step 6: Final answer
   x = 960.56