Finding the Fourth Proportional to 12,665.41, 18,998.37 and 3,900.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.41 : 18,998.37 = 3,900.32 : x
2. Step 2: Convert to fraction form
   12,665.41/18,998.37 = 3,900.32/x
3. Step 3: Cross multiply
   12,665.41x = 18,998.37 × 3,900.32
4. Step 4: Simplify right side
   12,665.41x = 74,099,627.49
5. Step 5: Solve for x
   x = 74,099,627.49/12,665.41
6. Step 6: Final answer
   x = 5,850.55