Finding the Third Proportional to 354,722 and 521,710

Step by Step Solution

1. Step 1: Write the proportion equation
   354,722 : 521,710 = 521,710 : x
2. Step 2: Convert to fraction form
   354,722/521,710 = 521,710/x
3. Step 3: Cross multiply
   354,722x = 521,710 × 521,710
4. Step 4: Simplify right side
   354,722x = 272,181,324,100
5. Step 5: Solve for x
   x = 272,181,324,100/354,722
6. Step 6: Final answer
   x = 767,308.83