Finding the Third Proportional to 389,470 and 851,030

Step by Step Solution

1. Step 1: Write the proportion equation
   389,470 : 851,030 = 851,030 : x
2. Step 2: Convert to fraction form
   389,470/851,030 = 851,030/x
3. Step 3: Cross multiply
   389,470x = 851,030 × 851,030
4. Step 4: Simplify right side
   389,470x = 724,252,060,900
5. Step 5: Solve for x
   x = 724,252,060,900/389,470
6. Step 6: Final answer
   x = 1,859,583.69