Finding the Third Proportional to 1,688.50 and 3,664

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.50 : 3,664 = 3,664 : x
2. Step 2: Convert to fraction form
   1,688.50/3,664 = 3,664/x
3. Step 3: Cross multiply
   1,688.50x = 3,664 × 3,664
4. Step 4: Simplify right side
   1,688.50x = 13,424,896
5. Step 5: Solve for x
   x = 13,424,896/1,688.50
6. Step 6: Final answer
   x = 7,950.78