Finding the Fourth Proportional to 642,018.24, 885,906.72 and 355,522.56

Step by Step Solution

1. Step 1: Write the proportion equation
   642,018.24 : 885,906.72 = 355,522.56 : x
2. Step 2: Convert to fraction form
   642,018.24/885,906.72 = 355,522.56/x
3. Step 3: Cross multiply
   642,018.24x = 885,906.72 × 355,522.56
4. Step 4: Simplify right side
   642,018.24x = 314,959,825,015.60
5. Step 5: Solve for x
   x = 314,959,825,015.60/642,018.24
6. Step 6: Final answer
   x = 490,577.69