Finding the Third Proportional to 215,388 and 441,540

Step by Step Solution

1. Step 1: Write the proportion equation
   215,388 : 441,540 = 441,540 : x
2. Step 2: Convert to fraction form
   215,388/441,540 = 441,540/x
3. Step 3: Cross multiply
   215,388x = 441,540 × 441,540
4. Step 4: Simplify right side
   215,388x = 194,957,571,600
5. Step 5: Solve for x
   x = 194,957,571,600/215,388
6. Step 6: Final answer
   x = 905,145.93