Finding the Fourth Proportional to 12,760.55, 17,609.95 and 7,725.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,760.55 : 17,609.95 = 7,725.70 : x
2. Step 2: Convert to fraction form
   12,760.55/17,609.95 = 7,725.70/x
3. Step 3: Cross multiply
   12,760.55x = 17,609.95 × 7,725.70
4. Step 4: Simplify right side
   12,760.55x = 136,049,190.72
5. Step 5: Solve for x
   x = 136,049,190.72/12,760.55
6. Step 6: Final answer
   x = 10,661.70