Finding the Third Proportional to 359,661 and 780,831

Step by Step Solution

1. Step 1: Write the proportion equation
   359,661 : 780,831 = 780,831 : x
2. Step 2: Convert to fraction form
   359,661/780,831 = 780,831/x
3. Step 3: Cross multiply
   359,661x = 780,831 × 780,831
4. Step 4: Simplify right side
   359,661x = 609,697,050,561
5. Step 5: Solve for x
   x = 609,697,050,561/359,661
6. Step 6: Final answer
   x = 1,695,199.23