Finding the Third Proportional to 397,455 and 861,553.50

Step by Step Solution

1. Step 1: Write the proportion equation
   397,455 : 861,553.50 = 861,553.50 : x
2. Step 2: Convert to fraction form
   397,455/861,553.50 = 861,553.50/x
3. Step 3: Cross multiply
   397,455x = 861,553.50 × 861,553.50
4. Step 4: Simplify right side
   397,455x = 742,274,433,362.25
5. Step 5: Solve for x
   x = 742,274,433,362.25/397,455
6. Step 6: Final answer
   x = 1,867,568.49