Finding the Fourth Proportional to 12,608.34, 17,403.71 and 8,640.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,608.34 : 17,403.71 = 8,640.96 : x
2. Step 2: Convert to fraction form
   12,608.34/17,403.71 = 8,640.96/x
3. Step 3: Cross multiply
   12,608.34x = 17,403.71 × 8,640.96
4. Step 4: Simplify right side
   12,608.34x = 150,384,718.76
5. Step 5: Solve for x
   x = 150,384,718.76/12,608.34
6. Step 6: Final answer
   x = 11,927.40