Finding the Fourth Proportional to 12,456.88, 18,684.64 and 4,665.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.88 : 18,684.64 = 4,665.12 : x
2. Step 2: Convert to fraction form
   12,456.88/18,684.64 = 4,665.12/x
3. Step 3: Cross multiply
   12,456.88x = 18,684.64 × 4,665.12
4. Step 4: Simplify right side
   12,456.88x = 87,166,087.76
5. Step 5: Solve for x
   x = 87,166,087.76/12,456.88
6. Step 6: Final answer
   x = 6,997.43