Finding the Third Proportional to 330,489 and 680,539.50

Step by Step Solution

1. Step 1: Write the proportion equation
   330,489 : 680,539.50 = 680,539.50 : x
2. Step 2: Convert to fraction form
   330,489/680,539.50 = 680,539.50/x
3. Step 3: Cross multiply
   330,489x = 680,539.50 × 680,539.50
4. Step 4: Simplify right side
   330,489x = 463,134,011,060.25
5. Step 5: Solve for x
   x = 463,134,011,060.25/330,489
6. Step 6: Final answer
   x = 1,401,359.84