Finding the Fourth Proportional to 12,818.86, 17,689.35 and 7,229.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.86 : 17,689.35 = 7,229.50 : x
2. Step 2: Convert to fraction form
   12,818.86/17,689.35 = 7,229.50/x
3. Step 3: Cross multiply
   12,818.86x = 17,689.35 × 7,229.50
4. Step 4: Simplify right side
   12,818.86x = 127,885,155.83
5. Step 5: Solve for x
   x = 127,885,155.83/12,818.86
6. Step 6: Final answer
   x = 9,976.33