Finding the Third Proportional to 410,364 and 621,012

Step by Step Solution

1. Step 1: Write the proportion equation
   410,364 : 621,012 = 621,012 : x
2. Step 2: Convert to fraction form
   410,364/621,012 = 621,012/x
3. Step 3: Cross multiply
   410,364x = 621,012 × 621,012
4. Step 4: Simplify right side
   410,364x = 385,655,904,144
5. Step 5: Solve for x
   x = 385,655,904,144/410,364
6. Step 6: Final answer
   x = 939,789.81