Finding the Fourth Proportional to 18,978.12, 26,187.82 and 11,018.79

Step by Step Solution

1. Step 1: Write the proportion equation
   18,978.12 : 26,187.82 = 11,018.79 : x
2. Step 2: Convert to fraction form
   18,978.12/26,187.82 = 11,018.79/x
3. Step 3: Cross multiply
   18,978.12x = 26,187.82 × 11,018.79
4. Step 4: Simplify right side
   18,978.12x = 288,558,061.59
5. Step 5: Solve for x
   x = 288,558,061.59/18,978.12
6. Step 6: Final answer
   x = 15,204.78