Finding the Third Proportional to 330,828 and 717,655.50

Step by Step Solution

1. Step 1: Write the proportion equation
   330,828 : 717,655.50 = 717,655.50 : x
2. Step 2: Convert to fraction form
   330,828/717,655.50 = 717,655.50/x
3. Step 3: Cross multiply
   330,828x = 717,655.50 × 717,655.50
4. Step 4: Simplify right side
   330,828x = 515,029,416,680.25
5. Step 5: Solve for x
   x = 515,029,416,680.25/330,828
6. Step 6: Final answer
   x = 1,556,789.08