Finding the Fourth Proportional to 449,945.89, 620,963.72 and 256,412.79

Step by Step Solution

1. Step 1: Write the proportion equation
   449,945.89 : 620,963.72 = 256,412.79 : x
2. Step 2: Convert to fraction form
   449,945.89/620,963.72 = 256,412.79/x
3. Step 3: Cross multiply
   449,945.89x = 620,963.72 × 256,412.79
4. Step 4: Simplify right side
   449,945.89x = 159,223,039,613.46
5. Step 5: Solve for x
   x = 159,223,039,613.46/449,945.89
6. Step 6: Final answer
   x = 353,871.53