Finding the Fourth Proportional to 12,128.67, 18,190.94 and 3,361.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.67 : 18,190.94 = 3,361.55 : x
2. Step 2: Convert to fraction form
   12,128.67/18,190.94 = 3,361.55/x
3. Step 3: Cross multiply
   12,128.67x = 18,190.94 × 3,361.55
4. Step 4: Simplify right side
   12,128.67x = 61,149,646.59
5. Step 5: Solve for x
   x = 61,149,646.59/12,128.67
6. Step 6: Final answer
   x = 5,041.74