Finding the Third Proportional to 355,359 and 777,145.50

Step by Step Solution

1. Step 1: Write the proportion equation
   355,359 : 777,145.50 = 777,145.50 : x
2. Step 2: Convert to fraction form
   355,359/777,145.50 = 777,145.50/x
3. Step 3: Cross multiply
   355,359x = 777,145.50 × 777,145.50
4. Step 4: Simplify right side
   355,359x = 603,955,128,170.25
5. Step 5: Solve for x
   x = 603,955,128,170.25/355,359
6. Step 6: Final answer
   x = 1,699,563.34