Finding the Third Proportional to 414,440.50 and 641,890

Step by Step Solution

1. Step 1: Write the proportion equation
   414,440.50 : 641,890 = 641,890 : x
2. Step 2: Convert to fraction form
   414,440.50/641,890 = 641,890/x
3. Step 3: Cross multiply
   414,440.50x = 641,890 × 641,890
4. Step 4: Simplify right side
   414,440.50x = 412,022,772,100
5. Step 5: Solve for x
   x = 412,022,772,100/414,440.50
6. Step 6: Final answer
   x = 994,166.28