Finding the Third Proportional to 643,286 and 946,217.75

Step by Step Solution

1. Step 1: Write the proportion equation
   643,286 : 946,217.75 = 946,217.75 : x
2. Step 2: Convert to fraction form
   643,286/946,217.75 = 946,217.75/x
3. Step 3: Cross multiply
   643,286x = 946,217.75 × 946,217.75
4. Step 4: Simplify right side
   643,286x = 895,328,030,415.06
5. Step 5: Solve for x
   x = 895,328,030,415.06/643,286
6. Step 6: Final answer
   x = 1,391,804.00