Finding the Fourth Proportional to 395,406.42, 545,699.89 and 225,665.94

Step by Step Solution

1. Step 1: Write the proportion equation
   395,406.42 : 545,699.89 = 225,665.94 : x
2. Step 2: Convert to fraction form
   395,406.42/545,699.89 = 225,665.94/x
3. Step 3: Cross multiply
   395,406.42x = 545,699.89 × 225,665.94
4. Step 4: Simplify right side
   395,406.42x = 123,145,878,634.75
5. Step 5: Solve for x
   x = 123,145,878,634.75/395,406.42
6. Step 6: Final answer
   x = 311,441.27