Finding the Third Proportional to 81,811 and 178,404

Step by Step Solution

1. Step 1: Write the proportion equation
   81,811 : 178,404 = 178,404 : x
2. Step 2: Convert to fraction form
   81,811/178,404 = 178,404/x
3. Step 3: Cross multiply
   81,811x = 178,404 × 178,404
4. Step 4: Simplify right side
   81,811x = 31,827,987,216
5. Step 5: Solve for x
   x = 31,827,987,216/81,811
6. Step 6: Final answer
   x = 389,042.88