Finding the Fourth Proportional to 8,317.42, 12,481.56 and 3,123.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,317.42 : 12,481.56 = 3,123.28 : x
2. Step 2: Convert to fraction form
   8,317.42/12,481.56 = 3,123.28/x
3. Step 3: Cross multiply
   8,317.42x = 12,481.56 × 3,123.28
4. Step 4: Simplify right side
   8,317.42x = 38,983,406.72
5. Step 5: Solve for x
   x = 38,983,406.72/8,317.42
6. Step 6: Final answer
   x = 4,686.96