Finding the Third Proportional to 263,139 and 408,190.50

Step by Step Solution

1. Step 1: Write the proportion equation
   263,139 : 408,190.50 = 408,190.50 : x
2. Step 2: Convert to fraction form
   263,139/408,190.50 = 408,190.50/x
3. Step 3: Cross multiply
   263,139x = 408,190.50 × 408,190.50
4. Step 4: Simplify right side
   263,139x = 166,619,484,290.25
5. Step 5: Solve for x
   x = 166,619,484,290.25/263,139
6. Step 6: Final answer
   x = 633,199.50