Finding the Third Proportional to 393,903 and 864,069.19

Step by Step Solution

1. Step 1: Write the proportion equation
   393,903 : 864,069.19 = 864,069.19 : x
2. Step 2: Convert to fraction form
   393,903/864,069.19 = 864,069.19/x
3. Step 3: Cross multiply
   393,903x = 864,069.19 × 864,069.19
4. Step 4: Simplify right side
   393,903x = 746,615,560,786.91
5. Step 5: Solve for x
   x = 746,615,560,786.91/393,903
6. Step 6: Final answer
   x = 1,895,429.99