Finding the Fourth Proportional to 209,196.78, 288,694.50 and 113,703.48

Step by Step Solution

1. Step 1: Write the proportion equation
   209,196.78 : 288,694.50 = 113,703.48 : x
2. Step 2: Convert to fraction form
   209,196.78/288,694.50 = 113,703.48/x
3. Step 3: Cross multiply
   209,196.78x = 288,694.50 × 113,703.48
4. Step 4: Simplify right side
   209,196.78x = 32,825,569,306.86
5. Step 5: Solve for x
   x = 32,825,569,306.86/209,196.78
6. Step 6: Final answer
   x = 156,912.40