Finding the Third Proportional to 356,900 and 521,940

Step by Step Solution

1. Step 1: Write the proportion equation
   356,900 : 521,940 = 521,940 : x
2. Step 2: Convert to fraction form
   356,900/521,940 = 521,940/x
3. Step 3: Cross multiply
   356,900x = 521,940 × 521,940
4. Step 4: Simplify right side
   356,900x = 272,421,363,600
5. Step 5: Solve for x
   x = 272,421,363,600/356,900
6. Step 6: Final answer
   x = 763,298.86