Finding the Fourth Proportional to 209,173.45, 288,661.59 and 113,680.15

Step by Step Solution

1. Step 1: Write the proportion equation
   209,173.45 : 288,661.59 = 113,680.15 : x
2. Step 2: Convert to fraction form
   209,173.45/288,661.59 = 113,680.15/x
3. Step 3: Cross multiply
   209,173.45x = 288,661.59 × 113,680.15
4. Step 4: Simplify right side
   209,173.45x = 32,815,092,850.44
5. Step 5: Solve for x
   x = 32,815,092,850.44/209,173.45
6. Step 6: Final answer
   x = 156,879.82