Finding the Third Proportional to 646,666.50 and 978,946.50

Step by Step Solution

1. Step 1: Write the proportion equation
   646,666.50 : 978,946.50 = 978,946.50 : x
2. Step 2: Convert to fraction form
   646,666.50/978,946.50 = 978,946.50/x
3. Step 3: Cross multiply
   646,666.50x = 978,946.50 × 978,946.50
4. Step 4: Simplify right side
   646,666.50x = 958,336,249,862.25
5. Step 5: Solve for x
   x = 958,336,249,862.25/646,666.50
6. Step 6: Final answer
   x = 1,481,963.65