Finding the Third Proportional to 195,918 and 400,139

Step by Step Solution

1. Step 1: Write the proportion equation
   195,918 : 400,139 = 400,139 : x
2. Step 2: Convert to fraction form
   195,918/400,139 = 400,139/x
3. Step 3: Cross multiply
   195,918x = 400,139 × 400,139
4. Step 4: Simplify right side
   195,918x = 160,111,219,321
5. Step 5: Solve for x
   x = 160,111,219,321/195,918
6. Step 6: Final answer
   x = 817,235.88