Finding the Fourth Proportional to 18,681.82, 28,003.82 and 12,112.18

Step by Step Solution

1. Step 1: Write the proportion equation
   18,681.82 : 28,003.82 = 12,112.18 : x
2. Step 2: Convert to fraction form
   18,681.82/28,003.82 = 12,112.18/x
3. Step 3: Cross multiply
   18,681.82x = 28,003.82 × 12,112.18
4. Step 4: Simplify right side
   18,681.82x = 339,187,308.53
5. Step 5: Solve for x
   x = 339,187,308.53/18,681.82
6. Step 6: Final answer
   x = 18,156.01