Finding the Third Proportional to 389,484 and 851,064

Step by Step Solution

1. Step 1: Write the proportion equation
   389,484 : 851,064 = 851,064 : x
2. Step 2: Convert to fraction form
   389,484/851,064 = 851,064/x
3. Step 3: Cross multiply
   389,484x = 851,064 × 851,064
4. Step 4: Simplify right side
   389,484x = 724,309,932,096
5. Step 5: Solve for x
   x = 724,309,932,096/389,484
6. Step 6: Final answer
   x = 1,859,665.43