Finding the Fourth Proportional to 8,123.48, 12,171.35 and 4,419.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.48 : 12,171.35 = 4,419.09 : x
2. Step 2: Convert to fraction form
   8,123.48/12,171.35 = 4,419.09/x
3. Step 3: Cross multiply
   8,123.48x = 12,171.35 × 4,419.09
4. Step 4: Simplify right side
   8,123.48x = 53,786,268.98
5. Step 5: Solve for x
   x = 53,786,268.98/8,123.48
6. Step 6: Final answer
   x = 6,621.09