Finding the Fourth Proportional to 11,121.50, 16,667.88 and 8,326.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,121.50 : 16,667.88 = 8,326.28 : x
2. Step 2: Convert to fraction form
   11,121.50/16,667.88 = 8,326.28/x
3. Step 3: Cross multiply
   11,121.50x = 16,667.88 × 8,326.28
4. Step 4: Simplify right side
   11,121.50x = 138,781,435.89
5. Step 5: Solve for x
   x = 138,781,435.89/11,121.50
6. Step 6: Final answer
   x = 12,478.66