Finding the Third Proportional to 354,829.50 and 820,611

Step by Step Solution

1. Step 1: Write the proportion equation
   354,829.50 : 820,611 = 820,611 : x
2. Step 2: Convert to fraction form
   354,829.50/820,611 = 820,611/x
3. Step 3: Cross multiply
   354,829.50x = 820,611 × 820,611
4. Step 4: Simplify right side
   354,829.50x = 673,402,413,321
5. Step 5: Solve for x
   x = 673,402,413,321/354,829.50
6. Step 6: Final answer
   x = 1,897,819.69