Finding the Third Proportional to 216,554 and 333,288

Step by Step Solution

1. Step 1: Write the proportion equation
   216,554 : 333,288 = 333,288 : x
2. Step 2: Convert to fraction form
   216,554/333,288 = 333,288/x
3. Step 3: Cross multiply
   216,554x = 333,288 × 333,288
4. Step 4: Simplify right side
   216,554x = 111,080,890,944
5. Step 5: Solve for x
   x = 111,080,890,944/216,554
6. Step 6: Final answer
   x = 512,947.77