Finding the Fourth Proportional to 209,016.50, 288,453.72 and 122,979.92

Step by Step Solution

1. Step 1: Write the proportion equation
   209,016.50 : 288,453.72 = 122,979.92 : x
2. Step 2: Convert to fraction form
   209,016.50/288,453.72 = 122,979.92/x
3. Step 3: Cross multiply
   209,016.50x = 288,453.72 × 122,979.92
4. Step 4: Simplify right side
   209,016.50x = 35,474,015,409.30
5. Step 5: Solve for x
   x = 35,474,015,409.30/209,016.50
6. Step 6: Final answer
   x = 169,718.73