Finding the Third Proportional to 216,636 and 334,788

Step by Step Solution

1. Step 1: Write the proportion equation
   216,636 : 334,788 = 334,788 : x
2. Step 2: Convert to fraction form
   216,636/334,788 = 334,788/x
3. Step 3: Cross multiply
   216,636x = 334,788 × 334,788
4. Step 4: Simplify right side
   216,636x = 112,083,004,944
5. Step 5: Solve for x
   x = 112,083,004,944/216,636
6. Step 6: Final answer
   x = 517,379.41