Finding the Third Proportional to 395,809 and 771,813.50

Step by Step Solution

1. Step 1: Write the proportion equation
   395,809 : 771,813.50 = 771,813.50 : x
2. Step 2: Convert to fraction form
   395,809/771,813.50 = 771,813.50/x
3. Step 3: Cross multiply
   395,809x = 771,813.50 × 771,813.50
4. Step 4: Simplify right side
   395,809x = 595,696,078,782.25
5. Step 5: Solve for x
   x = 595,696,078,782.25/395,809
6. Step 6: Final answer
   x = 1,505,008.93