Finding the Third Proportional to 395,409 and 612,776.25

Step by Step Solution

1. Step 1: Write the proportion equation
   395,409 : 612,776.25 = 612,776.25 : x
2. Step 2: Convert to fraction form
   395,409/612,776.25 = 612,776.25/x
3. Step 3: Cross multiply
   395,409x = 612,776.25 × 612,776.25
4. Step 4: Simplify right side
   395,409x = 375,494,732,564.06
5. Step 5: Solve for x
   x = 375,494,732,564.06/395,409
6. Step 6: Final answer
   x = 949,636.28