Finding the Fourth Proportional to 208,661.78, 287,951.82 and 113,168.72

Step by Step Solution

1. Step 1: Write the proportion equation
   208,661.78 : 287,951.82 = 113,168.72 : x
2. Step 2: Convert to fraction form
   208,661.78/287,951.82 = 113,168.72/x
3. Step 3: Cross multiply
   208,661.78x = 287,951.82 × 113,168.72
4. Step 4: Simplify right side
   208,661.78x = 32,587,138,891.07
5. Step 5: Solve for x
   x = 32,587,138,891.07/208,661.78
6. Step 6: Final answer
   x = 156,172.05