Finding the Third Proportional to 309,938 and 478,934

Step by Step Solution

1. Step 1: Write the proportion equation
   309,938 : 478,934 = 478,934 : x
2. Step 2: Convert to fraction form
   309,938/478,934 = 478,934/x
3. Step 3: Cross multiply
   309,938x = 478,934 × 478,934
4. Step 4: Simplify right side
   309,938x = 229,377,776,356
5. Step 5: Solve for x
   x = 229,377,776,356/309,938
6. Step 6: Final answer
   x = 740,076.33