Finding the Fourth Proportional to 8,081.80, 12,118.14 and 3,145.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.80 : 12,118.14 = 3,145.78 : x
2. Step 2: Convert to fraction form
   8,081.80/12,118.14 = 3,145.78/x
3. Step 3: Cross multiply
   8,081.80x = 12,118.14 × 3,145.78
4. Step 4: Simplify right side
   8,081.80x = 38,121,002.45
5. Step 5: Solve for x
   x = 38,121,002.45/8,081.80
6. Step 6: Final answer
   x = 4,716.90