Finding the Fourth Proportional to 209,010.72, 288,238.32 and 161,188.32

Step by Step Solution

1. Step 1: Write the proportion equation
   209,010.72 : 288,238.32 = 161,188.32 : x
2. Step 2: Convert to fraction form
   209,010.72/288,238.32 = 161,188.32/x
3. Step 3: Cross multiply
   209,010.72x = 288,238.32 × 161,188.32
4. Step 4: Simplify right side
   209,010.72x = 46,460,650,560.42
5. Step 5: Solve for x
   x = 46,460,650,560.42/209,010.72
6. Step 6: Final answer
   x = 222,288.36