Finding the Fourth Proportional to 209,379.20, 288,942.72 and 117,498.56

Step by Step Solution

1. Step 1: Write the proportion equation
   209,379.20 : 288,942.72 = 117,498.56 : x
2. Step 2: Convert to fraction form
   209,379.20/288,942.72 = 117,498.56/x
3. Step 3: Cross multiply
   209,379.20x = 288,942.72 × 117,498.56
4. Step 4: Simplify right side
   209,379.20x = 33,950,353,522.48
5. Step 5: Solve for x
   x = 33,950,353,522.48/209,379.20
6. Step 6: Final answer
   x = 162,147.69