Finding the Third Proportional to 449,770 and 643,176.50

Step by Step Solution

1. Step 1: Write the proportion equation
   449,770 : 643,176.50 = 643,176.50 : x
2. Step 2: Convert to fraction form
   449,770/643,176.50 = 643,176.50/x
3. Step 3: Cross multiply
   449,770x = 643,176.50 × 643,176.50
4. Step 4: Simplify right side
   449,770x = 413,676,010,152.25
5. Step 5: Solve for x
   x = 413,676,010,152.25/449,770
6. Step 6: Final answer
   x = 919,750.12