Finding the Third Proportional to 195,918.50 and 400,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   195,918.50 : 400,139.50 = 400,139.50 : x
2. Step 2: Convert to fraction form
   195,918.50/400,139.50 = 400,139.50/x
3. Step 3: Cross multiply
   195,918.50x = 400,139.50 × 400,139.50
4. Step 4: Simplify right side
   195,918.50x = 160,111,619,460.25
5. Step 5: Solve for x
   x = 160,111,619,460.25/195,918.50
6. Step 6: Final answer
   x = 817,235.84