Finding the Fourth Proportional to 12,425.18, 18,640.47 and 7,163.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,425.18 : 18,640.47 = 7,163.60 : x
2. Step 2: Convert to fraction form
   12,425.18/18,640.47 = 7,163.60/x
3. Step 3: Cross multiply
   12,425.18x = 18,640.47 × 7,163.60
4. Step 4: Simplify right side
   12,425.18x = 133,532,870.89
5. Step 5: Solve for x
   x = 133,532,870.89/12,425.18
6. Step 6: Final answer
   x = 10,746.96