Finding the Third Proportional to 343,956.38 and 521,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   343,956.38 : 521,128.69 = 521,128.69 : x
2. Step 2: Convert to fraction form
   343,956.38/521,128.69 = 521,128.69/x
3. Step 3: Cross multiply
   343,956.38x = 521,128.69 × 521,128.69
4. Step 4: Simplify right side
   343,956.38x = 271,575,108,935.47
5. Step 5: Solve for x
   x = 271,575,108,935.47/343,956.38
6. Step 6: Final answer
   x = 789,562.66