Finding the Third Proportional to 399,662 and 872,540

Step by Step Solution

1. Step 1: Write the proportion equation
   399,662 : 872,540 = 872,540 : x
2. Step 2: Convert to fraction form
   399,662/872,540 = 872,540/x
3. Step 3: Cross multiply
   399,662x = 872,540 × 872,540
4. Step 4: Simplify right side
   399,662x = 761,326,051,600
5. Step 5: Solve for x
   x = 761,326,051,600/399,662
6. Step 6: Final answer
   x = 1,904,924.79