Finding the Fourth Proportional to 18,919.69, 26,111.67 and 12,224.78

Step by Step Solution

1. Step 1: Write the proportion equation
   18,919.69 : 26,111.67 = 12,224.78 : x
2. Step 2: Convert to fraction form
   18,919.69/26,111.67 = 12,224.78/x
3. Step 3: Cross multiply
   18,919.69x = 26,111.67 × 12,224.78
4. Step 4: Simplify right side
   18,919.69x = 319,209,592.72
5. Step 5: Solve for x
   x = 319,209,592.72/18,919.69
6. Step 6: Final answer
   x = 16,871.82