Finding the Fourth Proportional to 209,010.86, 288,430.24 and 113,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   209,010.86 : 288,430.24 = 113,515.50 : x
2. Step 2: Convert to fraction form
   209,010.86/288,430.24 = 113,515.50/x
3. Step 3: Cross multiply
   209,010.86x = 288,430.24 × 113,515.50
4. Step 4: Simplify right side
   209,010.86x = 32,741,302,908.72
5. Step 5: Solve for x
   x = 32,741,302,908.72/209,010.86
6. Step 6: Final answer
   x = 156,648.81