Finding the Fourth Proportional to 12,672.72, 19,008.18 and 3,906.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,672.72 : 19,008.18 = 3,906.72 : x
2. Step 2: Convert to fraction form
   12,672.72/19,008.18 = 3,906.72/x
3. Step 3: Cross multiply
   12,672.72x = 19,008.18 × 3,906.72
4. Step 4: Simplify right side
   12,672.72x = 74,259,636.97
5. Step 5: Solve for x
   x = 74,259,636.97/12,672.72
6. Step 6: Final answer
   x = 5,859.80