Finding the Third Proportional to 1,680.75 and 3,609.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.75 : 3,609.56 = 3,609.56 : x
2. Step 2: Convert to fraction form
   1,680.75/3,609.56 = 3,609.56/x
3. Step 3: Cross multiply
   1,680.75x = 3,609.56 × 3,609.56
4. Step 4: Simplify right side
   1,680.75x = 13,028,941.44
5. Step 5: Solve for x
   x = 13,028,941.44/1,680.75
6. Step 6: Final answer
   x = 7,751.86