Finding the Fourth Proportional to 309,505.34, 424,335.78 and 303,906.62

Step by Step Solution

1. Step 1: Write the proportion equation
   309,505.34 : 424,335.78 = 303,906.62 : x
2. Step 2: Convert to fraction form
   309,505.34/424,335.78 = 303,906.62/x
3. Step 3: Cross multiply
   309,505.34x = 424,335.78 × 303,906.62
4. Step 4: Simplify right side
   309,505.34x = 128,958,452,644.86
5. Step 5: Solve for x
   x = 128,958,452,644.86/309,505.34
6. Step 6: Final answer
   x = 416,659.86