Finding the Fourth Proportional to 8,105.34, 12,158.69 and 2,557.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,105.34 : 12,158.69 = 2,557.20 : x
2. Step 2: Convert to fraction form
   8,105.34/12,158.69 = 2,557.20/x
3. Step 3: Cross multiply
   8,105.34x = 12,158.69 × 2,557.20
4. Step 4: Simplify right side
   8,105.34x = 31,092,157.46
5. Step 5: Solve for x
   x = 31,092,157.46/8,105.34
6. Step 6: Final answer
   x = 3,836.01