Finding the Third Proportional to 348,448 and 521,308

Step by Step Solution

1. Step 1: Write the proportion equation
   348,448 : 521,308 = 521,308 : x
2. Step 2: Convert to fraction form
   348,448/521,308 = 521,308/x
3. Step 3: Cross multiply
   348,448x = 521,308 × 521,308
4. Step 4: Simplify right side
   348,448x = 271,762,030,864
5. Step 5: Solve for x
   x = 271,762,030,864/348,448
6. Step 6: Final answer
   x = 779,921.34