Finding the Third Proportional to 3,405.50 and 4,689.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,405.50 : 4,689.50 = 4,689.50 : x
2. Step 2: Convert to fraction form
   3,405.50/4,689.50 = 4,689.50/x
3. Step 3: Cross multiply
   3,405.50x = 4,689.50 × 4,689.50
4. Step 4: Simplify right side
   3,405.50x = 21,991,410.25
5. Step 5: Solve for x
   x = 21,991,410.25/3,405.50
6. Step 6: Final answer
   x = 6,457.62