Finding the Fourth Proportional to 641,499.18, 885,269.94 and 355,019.34

Step by Step Solution

1. Step 1: Write the proportion equation
   641,499.18 : 885,269.94 = 355,019.34 : x
2. Step 2: Convert to fraction form
   641,499.18/885,269.94 = 355,019.34/x
3. Step 3: Cross multiply
   641,499.18x = 885,269.94 × 355,019.34
4. Step 4: Simplify right side
   641,499.18x = 314,287,949,820.64
5. Step 5: Solve for x
   x = 314,287,949,820.64/641,499.18
6. Step 6: Final answer
   x = 489,927.28