Finding the Fourth Proportional to 630,605.72, 870,264.24 and 355,058.45

Step by Step Solution

1. Step 1: Write the proportion equation
   630,605.72 : 870,264.24 = 355,058.45 : x
2. Step 2: Convert to fraction form
   630,605.72/870,264.24 = 355,058.45/x
3. Step 3: Cross multiply
   630,605.72x = 870,264.24 × 355,058.45
4. Step 4: Simplify right side
   630,605.72x = 308,994,672,144.83
5. Step 5: Solve for x
   x = 308,994,672,144.83/630,605.72
6. Step 6: Final answer
   x = 489,996.62