Finding the Third Proportional to 643,290 and 946,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,290 : 946,222.50 = 946,222.50 : x
2. Step 2: Convert to fraction form
   643,290/946,222.50 = 946,222.50/x
3. Step 3: Cross multiply
   643,290x = 946,222.50 × 946,222.50
4. Step 4: Simplify right side
   643,290x = 895,337,019,506.25
5. Step 5: Solve for x
   x = 895,337,019,506.25/643,290
6. Step 6: Final answer
   x = 1,391,809.32