Finding the Fourth Proportional to 2,200.54, 3,300.72 and 640.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,200.54 : 3,300.72 = 640.51 : x
2. Step 2: Convert to fraction form
   2,200.54/3,300.72 = 640.51/x
3. Step 3: Cross multiply
   2,200.54x = 3,300.72 × 640.51
4. Step 4: Simplify right side
   2,200.54x = 2,114,144.17
5. Step 5: Solve for x
   x = 2,114,144.17/2,200.54
6. Step 6: Final answer
   x = 960.74