Finding the Fourth Proportional to 12,759.15, 17,608.05 and 7,724.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,759.15 : 17,608.05 = 7,724.28 : x
2. Step 2: Convert to fraction form
   12,759.15/17,608.05 = 7,724.28/x
3. Step 3: Cross multiply
   12,759.15x = 17,608.05 × 7,724.28
4. Step 4: Simplify right side
   12,759.15x = 136,009,508.45
5. Step 5: Solve for x
   x = 136,009,508.45/12,759.15
6. Step 6: Final answer
   x = 10,659.76