Finding the Fourth Proportional to 309,152.68, 428,813.37 and 300,958.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,152.68 : 428,813.37 = 300,958.72 : x
2. Step 2: Convert to fraction form
   309,152.68/428,813.37 = 300,958.72/x
3. Step 3: Cross multiply
   309,152.68x = 428,813.37 × 300,958.72
4. Step 4: Simplify right side
   309,152.68x = 129,055,122,954.09
5. Step 5: Solve for x
   x = 129,055,122,954.09/309,152.68
6. Step 6: Final answer
   x = 417,447.85