Finding the Third Proportional to 343,962 and 521,145

Step by Step Solution

1. Step 1: Write the proportion equation
   343,962 : 521,145 = 521,145 : x
2. Step 2: Convert to fraction form
   343,962/521,145 = 521,145/x
3. Step 3: Cross multiply
   343,962x = 521,145 × 521,145
4. Step 4: Simplify right side
   343,962x = 271,592,111,025
5. Step 5: Solve for x
   x = 271,592,111,025/343,962
6. Step 6: Final answer
   x = 789,599.17