Finding the Third Proportional to 310,945.50 and 641,520

Step by Step Solution

1. Step 1: Write the proportion equation
   310,945.50 : 641,520 = 641,520 : x
2. Step 2: Convert to fraction form
   310,945.50/641,520 = 641,520/x
3. Step 3: Cross multiply
   310,945.50x = 641,520 × 641,520
4. Step 4: Simplify right side
   310,945.50x = 411,547,910,400
5. Step 5: Solve for x
   x = 411,547,910,400/310,945.50
6. Step 6: Final answer
   x = 1,323,537.12