Finding the Fourth Proportional to 8,108.56, 12,153.96 and 3,172.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,108.56 : 12,153.96 = 3,172.78 : x
2. Step 2: Convert to fraction form
   8,108.56/12,153.96 = 3,172.78/x
3. Step 3: Cross multiply
   8,108.56x = 12,153.96 × 3,172.78
4. Step 4: Simplify right side
   8,108.56x = 38,561,764.58
5. Step 5: Solve for x
   x = 38,561,764.58/8,108.56
6. Step 6: Final answer
   x = 4,755.69