Finding the Fourth Proportional to 12,618.04, 18,906.24 and 7,672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,618.04 : 18,906.24 = 7,672.72 : x
2. Step 2: Convert to fraction form
   12,618.04/18,906.24 = 7,672.72/x
3. Step 3: Cross multiply
   12,618.04x = 18,906.24 × 7,672.72
4. Step 4: Simplify right side
   12,618.04x = 145,062,285.77
5. Step 5: Solve for x
   x = 145,062,285.77/12,618.04
6. Step 6: Final answer
   x = 11,496.42