Finding the Third Proportional to 355,771.50 and 777,909

Step by Step Solution

1. Step 1: Write the proportion equation
   355,771.50 : 777,909 = 777,909 : x
2. Step 2: Convert to fraction form
   355,771.50/777,909 = 777,909/x
3. Step 3: Cross multiply
   355,771.50x = 777,909 × 777,909
4. Step 4: Simplify right side
   355,771.50x = 605,142,412,281
5. Step 5: Solve for x
   x = 605,142,412,281/355,771.50
6. Step 6: Final answer
   x = 1,700,929.99