Finding the Third Proportional to 643,779 and 995,260.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,779 : 995,260.50 = 995,260.50 : x
2. Step 2: Convert to fraction form
   643,779/995,260.50 = 995,260.50/x
3. Step 3: Cross multiply
   643,779x = 995,260.50 × 995,260.50
4. Step 4: Simplify right side
   643,779x = 990,543,462,860.25
5. Step 5: Solve for x
   x = 990,543,462,860.25/643,779
6. Step 6: Final answer
   x = 1,538,638.98