Finding the Fourth Proportional to 12,321.09, 18,478.94 and 3,554.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,321.09 : 18,478.94 = 3,554.10 : x
2. Step 2: Convert to fraction form
   12,321.09/18,478.94 = 3,554.10/x
3. Step 3: Cross multiply
   12,321.09x = 18,478.94 × 3,554.10
4. Step 4: Simplify right side
   12,321.09x = 65,675,982.88
5. Step 5: Solve for x
   x = 65,675,982.88/12,321.09
6. Step 6: Final answer
   x = 5,330.37