Finding the Third Proportional to 203,070.38 and 315,711

Step by Step Solution

1. Step 1: Write the proportion equation
   203,070.38 : 315,711 = 315,711 : x
2. Step 2: Convert to fraction form
   203,070.38/315,711 = 315,711/x
3. Step 3: Cross multiply
   203,070.38x = 315,711 × 315,711
4. Step 4: Simplify right side
   203,070.38x = 99,673,435,521
5. Step 5: Solve for x
   x = 99,673,435,521/203,070.38
6. Step 6: Final answer
   x = 490,831.99