Finding the Third Proportional to 669,218 and 1,019,510.50

Step by Step Solution

1. Step 1: Write the proportion equation
   669,218 : 1,019,510.50 = 1,019,510.50 : x
2. Step 2: Convert to fraction form
   669,218/1,019,510.50 = 1,019,510.50/x
3. Step 3: Cross multiply
   669,218x = 1,019,510.50 × 1,019,510.50
4. Step 4: Simplify right side
   669,218x = 1,039,401,659,610.25
5. Step 5: Solve for x
   x = 1,039,401,659,610.25/669,218
6. Step 6: Final answer
   x = 1,553,158.55