Finding the Fourth Proportional to 8,081.78, 12,117.72 and 3,145.68

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.78 : 12,117.72 = 3,145.68 : x
2. Step 2: Convert to fraction form
   8,081.78/12,117.72 = 3,145.68/x
3. Step 3: Cross multiply
   8,081.78x = 12,117.72 × 3,145.68
4. Step 4: Simplify right side
   8,081.78x = 38,118,469.45
5. Step 5: Solve for x
   x = 38,118,469.45/8,081.78
6. Step 6: Final answer
   x = 4,716.59