Finding the Fourth Proportional to 209,105.50, 288,568.21 and 113,613.79

Step by Step Solution

1. Step 1: Write the proportion equation
   209,105.50 : 288,568.21 = 113,613.79 : x
2. Step 2: Convert to fraction form
   209,105.50/288,568.21 = 113,613.79/x
3. Step 3: Cross multiply
   209,105.50x = 288,568.21 × 113,613.79
4. Step 4: Simplify right side
   209,105.50x = 32,785,328,011.62
5. Step 5: Solve for x
   x = 32,785,328,011.62/209,105.50
6. Step 6: Final answer
   x = 156,788.45