Finding the Third Proportional to 718,503 and 999,019.50

Step by Step Solution

1. Step 1: Write the proportion equation
   718,503 : 999,019.50 = 999,019.50 : x
2. Step 2: Convert to fraction form
   718,503/999,019.50 = 999,019.50/x
3. Step 3: Cross multiply
   718,503x = 999,019.50 × 999,019.50
4. Step 4: Simplify right side
   718,503x = 998,039,961,380.25
5. Step 5: Solve for x
   x = 998,039,961,380.25/718,503
6. Step 6: Final answer
   x = 1,389,054.69