Finding the Third Proportional to 1,640.81 and 3,200.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.81 : 3,200.63 = 3,200.63 : x
2. Step 2: Convert to fraction form
   1,640.81/3,200.63 = 3,200.63/x
3. Step 3: Cross multiply
   1,640.81x = 3,200.63 × 3,200.63
4. Step 4: Simplify right side
   1,640.81x = 10,244,000.39
5. Step 5: Solve for x
   x = 10,244,000.39/1,640.81
6. Step 6: Final answer
   x = 6,243.25