Finding the Fourth Proportional to 8,123.79, 12,185.76 and 3,443.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.79 : 12,185.76 = 3,443.21 : x
2. Step 2: Convert to fraction form
   8,123.79/12,185.76 = 3,443.21/x
3. Step 3: Cross multiply
   8,123.79x = 12,185.76 × 3,443.21
4. Step 4: Simplify right side
   8,123.79x = 41,958,069.76
5. Step 5: Solve for x
   x = 41,958,069.76/8,123.79
6. Step 6: Final answer
   x = 5,164.84