Finding the Third Proportional to 319,320 and 377,640.56

Step by Step Solution

1. Step 1: Write the proportion equation
   319,320 : 377,640.56 = 377,640.56 : x
2. Step 2: Convert to fraction form
   319,320/377,640.56 = 377,640.56/x
3. Step 3: Cross multiply
   319,320x = 377,640.56 × 377,640.56
4. Step 4: Simplify right side
   319,320x = 142,612,394,445.32
5. Step 5: Solve for x
   x = 142,612,394,445.32/319,320
6. Step 6: Final answer
   x = 446,612.78