Finding the Third Proportional to 403,842 and 622,609.50

Step by Step Solution

1. Step 1: Write the proportion equation
   403,842 : 622,609.50 = 622,609.50 : x
2. Step 2: Convert to fraction form
   403,842/622,609.50 = 622,609.50/x
3. Step 3: Cross multiply
   403,842x = 622,609.50 × 622,609.50
4. Step 4: Simplify right side
   403,842x = 387,642,589,490.25
5. Step 5: Solve for x
   x = 387,642,589,490.25/403,842
6. Step 6: Final answer
   x = 959,886.76