Finding the Third Proportional to 1,665.50 and 3,619

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.50 : 3,619 = 3,619 : x
2. Step 2: Convert to fraction form
   1,665.50/3,619 = 3,619/x
3. Step 3: Cross multiply
   1,665.50x = 3,619 × 3,619
4. Step 4: Simplify right side
   1,665.50x = 13,097,161
5. Step 5: Solve for x
   x = 13,097,161/1,665.50
6. Step 6: Final answer
   x = 7,863.80