Finding the Third Proportional to 643,263 and 943,408.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,263 : 943,408.50 = 943,408.50 : x
2. Step 2: Convert to fraction form
   643,263/943,408.50 = 943,408.50/x
3. Step 3: Cross multiply
   643,263x = 943,408.50 × 943,408.50
4. Step 4: Simplify right side
   643,263x = 890,019,597,872.25
5. Step 5: Solve for x
   x = 890,019,597,872.25/643,263
6. Step 6: Final answer
   x = 1,383,601.42