Finding the Fourth Proportional to 8,078.72, 12,117.12 and 2,606.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,078.72 : 12,117.12 = 2,606.72 : x
2. Step 2: Convert to fraction form
   8,078.72/12,117.12 = 2,606.72/x
3. Step 3: Cross multiply
   8,078.72x = 12,117.12 × 2,606.72
4. Step 4: Simplify right side
   8,078.72x = 31,585,939.05
5. Step 5: Solve for x
   x = 31,585,939.05/8,078.72
6. Step 6: Final answer
   x = 3,909.77