Finding the Third Proportional to 389,724 and 849,978

Step by Step Solution

1. Step 1: Write the proportion equation
   389,724 : 849,978 = 849,978 : x
2. Step 2: Convert to fraction form
   389,724/849,978 = 849,978/x
3. Step 3: Cross multiply
   389,724x = 849,978 × 849,978
4. Step 4: Simplify right side
   389,724x = 722,462,600,484
5. Step 5: Solve for x
   x = 722,462,600,484/389,724
6. Step 6: Final answer
   x = 1,853,780.11