Finding the Third Proportional to 405,930 and 631,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,930 : 631,042.50 = 631,042.50 : x
2. Step 2: Convert to fraction form
   405,930/631,042.50 = 631,042.50/x
3. Step 3: Cross multiply
   405,930x = 631,042.50 × 631,042.50
4. Step 4: Simplify right side
   405,930x = 398,214,636,806.25
5. Step 5: Solve for x
   x = 398,214,636,806.25/405,930
6. Step 6: Final answer
   x = 980,993.37