Finding the Third Proportional to 393,460.88 and 814,905

Step by Step Solution

1. Step 1: Write the proportion equation
   393,460.88 : 814,905 = 814,905 : x
2. Step 2: Convert to fraction form
   393,460.88/814,905 = 814,905/x
3. Step 3: Cross multiply
   393,460.88x = 814,905 × 814,905
4. Step 4: Simplify right side
   393,460.88x = 664,070,159,025
5. Step 5: Solve for x
   x = 664,070,159,025/393,460.88
6. Step 6: Final answer
   x = 1,687,766.69