Finding the Third Proportional to 389,634 and 528,003

Step by Step Solution

1. Step 1: Write the proportion equation
   389,634 : 528,003 = 528,003 : x
2. Step 2: Convert to fraction form
   389,634/528,003 = 528,003/x
3. Step 3: Cross multiply
   389,634x = 528,003 × 528,003
4. Step 4: Simplify right side
   389,634x = 278,787,168,009
5. Step 5: Solve for x
   x = 278,787,168,009/389,634
6. Step 6: Final answer
   x = 715,510.37