Finding the Fourth Proportional to 12,205.59, 18,288.79 and 7,511.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,205.59 : 18,288.79 = 7,511.74 : x
2. Step 2: Convert to fraction form
   12,205.59/18,288.79 = 7,511.74/x
3. Step 3: Cross multiply
   12,205.59x = 18,288.79 × 7,511.74
4. Step 4: Simplify right side
   12,205.59x = 137,380,570.89
5. Step 5: Solve for x
   x = 137,380,570.89/12,205.59
6. Step 6: Final answer
   x = 11,255.55