Finding the Third Proportional to 419,040 and 648,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   419,040 : 648,715.50 = 648,715.50 : x
2. Step 2: Convert to fraction form
   419,040/648,715.50 = 648,715.50/x
3. Step 3: Cross multiply
   419,040x = 648,715.50 × 648,715.50
4. Step 4: Simplify right side
   419,040x = 420,831,799,940.25
5. Step 5: Solve for x
   x = 420,831,799,940.25/419,040
6. Step 6: Final answer
   x = 1,004,275.96