Finding the Fourth Proportional to 400,128.56, 599,526.47 and 281,550.78

Step by Step Solution

1. Step 1: Write the proportion equation
   400,128.56 : 599,526.47 = 281,550.78 : x
2. Step 2: Convert to fraction form
   400,128.56/599,526.47 = 281,550.78/x
3. Step 3: Cross multiply
   400,128.56x = 599,526.47 × 281,550.78
4. Step 4: Simplify right side
   400,128.56x = 168,797,145,259.15
5. Step 5: Solve for x
   x = 168,797,145,259.15/400,128.56
6. Step 6: Final answer
   x = 421,857.28