Finding the Fourth Proportional to 12,105.18, 18,157.59 and 3,339.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.18 : 18,157.59 = 3,339.90 : x
2. Step 2: Convert to fraction form
   12,105.18/18,157.59 = 3,339.90/x
3. Step 3: Cross multiply
   12,105.18x = 18,157.59 × 3,339.90
4. Step 4: Simplify right side
   12,105.18x = 60,644,534.84
5. Step 5: Solve for x
   x = 60,644,534.84/12,105.18
6. Step 6: Final answer
   x = 5,009.80