Finding the Fourth Proportional to 209,577.35, 288,665.83 and 161,086.57

Step by Step Solution

1. Step 1: Write the proportion equation
   209,577.35 : 288,665.83 = 161,086.57 : x
2. Step 2: Convert to fraction form
   209,577.35/288,665.83 = 161,086.57/x
3. Step 3: Cross multiply
   209,577.35x = 288,665.83 × 161,086.57
4. Step 4: Simplify right side
   209,577.35x = 46,500,188,430.90
5. Step 5: Solve for x
   x = 46,500,188,430.90/209,577.35
6. Step 6: Final answer
   x = 221,876.02