Finding the Fourth Proportional to 288,520.56, 398,151 and 161,196.96

Step by Step Solution

1. Step 1: Write the proportion equation
   288,520.56 : 398,151 = 161,196.96 : x
2. Step 2: Convert to fraction form
   288,520.56/398,151 = 161,196.96/x
3. Step 3: Cross multiply
   288,520.56x = 398,151 × 161,196.96
4. Step 4: Simplify right side
   288,520.56x = 64,180,730,820.96
5. Step 5: Solve for x
   x = 64,180,730,820.96/288,520.56
6. Step 6: Final answer
   x = 222,447.69