Finding the Third Proportional to 1,621.69 and 2,431.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.69 : 2,431.69 = 2,431.69 : x
2. Step 2: Convert to fraction form
   1,621.69/2,431.69 = 2,431.69/x
3. Step 3: Cross multiply
   1,621.69x = 2,431.69 × 2,431.69
4. Step 4: Simplify right side
   1,621.69x = 5,913,104.10
5. Step 5: Solve for x
   x = 5,913,104.10/1,621.69
6. Step 6: Final answer
   x = 3,646.27