Finding the Third Proportional to 356,870 and 521,901

Step by Step Solution

1. Step 1: Write the proportion equation
   356,870 : 521,901 = 521,901 : x
2. Step 2: Convert to fraction form
   356,870/521,901 = 521,901/x
3. Step 3: Cross multiply
   356,870x = 521,901 × 521,901
4. Step 4: Simplify right side
   356,870x = 272,380,653,801
5. Step 5: Solve for x
   x = 272,380,653,801/356,870
6. Step 6: Final answer
   x = 763,248.95