Finding the Third Proportional to 389,036 and 805,072

Step by Step Solution

1. Step 1: Write the proportion equation
   389,036 : 805,072 = 805,072 : x
2. Step 2: Convert to fraction form
   389,036/805,072 = 805,072/x
3. Step 3: Cross multiply
   389,036x = 805,072 × 805,072
4. Step 4: Simplify right side
   389,036x = 648,140,925,184
5. Step 5: Solve for x
   x = 648,140,925,184/389,036
6. Step 6: Final answer
   x = 1,666,017.86