Finding the Fourth Proportional to 12,090.41, 18,141.20 and 5,518.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,090.41 : 18,141.20 = 5,518.61 : x
2. Step 2: Convert to fraction form
   12,090.41/18,141.20 = 5,518.61/x
3. Step 3: Cross multiply
   12,090.41x = 18,141.20 × 5,518.61
4. Step 4: Simplify right side
   12,090.41x = 100,114,089.43
5. Step 5: Solve for x
   x = 100,114,089.43/12,090.41
6. Step 6: Final answer
   x = 8,280.46