Finding the Fourth Proportional to 288,563.58, 398,216.89 and 161,239.27

Step by Step Solution

1. Step 1: Write the proportion equation
   288,563.58 : 398,216.89 = 161,239.27 : x
2. Step 2: Convert to fraction form
   288,563.58/398,216.89 = 161,239.27/x
3. Step 3: Cross multiply
   288,563.58x = 398,216.89 × 161,239.27
4. Step 4: Simplify right side
   288,563.58x = 64,208,200,645.27
5. Step 5: Solve for x
   x = 64,208,200,645.27/288,563.58
6. Step 6: Final answer
   x = 222,509.72