Finding the Third Proportional to 405,381 and 635,910

Step by Step Solution

1. Step 1: Write the proportion equation
   405,381 : 635,910 = 635,910 : x
2. Step 2: Convert to fraction form
   405,381/635,910 = 635,910/x
3. Step 3: Cross multiply
   405,381x = 635,910 × 635,910
4. Step 4: Simplify right side
   405,381x = 404,381,528,100
5. Step 5: Solve for x
   x = 404,381,528,100/405,381
6. Step 6: Final answer
   x = 997,534.49