Finding the Fourth Proportional to 288,635.69, 398,317.82 and 161,311.28

Step by Step Solution

1. Step 1: Write the proportion equation
   288,635.69 : 398,317.82 = 161,311.28 : x
2. Step 2: Convert to fraction form
   288,635.69/398,317.82 = 161,311.28/x
3. Step 3: Cross multiply
   288,635.69x = 398,317.82 × 161,311.28
4. Step 4: Simplify right side
   288,635.69x = 64,253,155,802.70
5. Step 5: Solve for x
   x = 64,253,155,802.70/288,635.69
6. Step 6: Final answer
   x = 222,609.88