Finding the Fourth Proportional to 8,107.98, 12,154.78 and 3,181.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,107.98 : 12,154.78 = 3,181.15 : x
2. Step 2: Convert to fraction form
   8,107.98/12,154.78 = 3,181.15/x
3. Step 3: Cross multiply
   8,107.98x = 12,154.78 × 3,181.15
4. Step 4: Simplify right side
   8,107.98x = 38,666,178.40
5. Step 5: Solve for x
   x = 38,666,178.40/8,107.98
6. Step 6: Final answer
   x = 4,768.90