Finding the Third Proportional to 397,861.88 and 814,105.69

Step by Step Solution

1. Step 1: Write the proportion equation
   397,861.88 : 814,105.69 = 814,105.69 : x
2. Step 2: Convert to fraction form
   397,861.88/814,105.69 = 814,105.69/x
3. Step 3: Cross multiply
   397,861.88x = 814,105.69 × 814,105.69
4. Step 4: Simplify right side
   397,861.88x = 662,768,070,419.85
5. Step 5: Solve for x
   x = 662,768,070,419.85/397,861.88
6. Step 6: Final answer
   x = 1,665,824.53