Finding the Third Proportional to 646,643.25 and 978,986.25

Step by Step Solution

1. Step 1: Write the proportion equation
   646,643.25 : 978,986.25 = 978,986.25 : x
2. Step 2: Convert to fraction form
   646,643.25/978,986.25 = 978,986.25/x
3. Step 3: Cross multiply
   646,643.25x = 978,986.25 × 978,986.25
4. Step 4: Simplify right side
   646,643.25x = 958,414,077,689.06
5. Step 5: Solve for x
   x = 958,414,077,689.06/646,643.25
6. Step 6: Final answer
   x = 1,482,137.30