Finding the Third Proportional to 389,988 and 570,210

Step by Step Solution

1. Step 1: Write the proportion equation
   389,988 : 570,210 = 570,210 : x
2. Step 2: Convert to fraction form
   389,988/570,210 = 570,210/x
3. Step 3: Cross multiply
   389,988x = 570,210 × 570,210
4. Step 4: Simplify right side
   389,988x = 325,139,444,100
5. Step 5: Solve for x
   x = 325,139,444,100/389,988
6. Step 6: Final answer
   x = 833,716.54