Finding the Fourth Proportional to 8,109.56, 12,155.45 and 3,173.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.56 : 12,155.45 = 3,173.78 : x
2. Step 2: Convert to fraction form
   8,109.56/12,155.45 = 3,173.78/x
3. Step 3: Cross multiply
   8,109.56x = 12,155.45 × 3,173.78
4. Step 4: Simplify right side
   8,109.56x = 38,578,724.10
5. Step 5: Solve for x
   x = 38,578,724.10/8,109.56
6. Step 6: Final answer
   x = 4,757.19